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Questions & Answers
Does the length stated for the brace sizes include both the mounting bracket and butt pad or is just the length of the bar itself i.e (8.25)

From A3's website it's just the length of the bar. For hinge add 7/16". The 43 Butt plate with rubber pad adds 11/16". The Magpul butt plates add 1+3/8" or 1-5/16". The xtendo narrow butt plate adds 2+1/2"

by andis, Verified Owner, August 20, 2025
What attachment type do I need for a Scorpion Evo3 S2 Micro? Expert Answer

To mount the A3 Tactical Modular Folding Stock w/ Picatinny 1913 Mount to your Scorpion EVO, you will need to purchase and install a 1913 interface on your receiver. I would recommend the Strike Industries CV EVO Stock Adapter w/QD Function, or the A3 Tactical Rear Stock Adapter for CZ Scorpion. Both options can be found linked below:
https://www.opticsplanet.com/strike-industries-cv-evo-stock-adapter-w-qd-function.html
https://www.opticsplanet.com/a3-tactical-rear-stock-adapter-for-cz-scorpion.html

by Ethan, Gear Expert, April 17, 2024
Customer Reviews
Helpful Positive Review Well made folding stock by maiti, Verified Owner, August 27, 2024
I really like the ability to tailor make my own A3 stock using the various components available. I would highly recommend visiting the A3 tactical website to get more detail idea of the components and their dimensions. The stock is solid with no woo...
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1/1 found this helpful
Helpful Positive Review A3 SIDE FOLDER by Gunfighterman, Verified Owner, April 25, 2024
This A3 side folder is very stable, strong and compact when folded. I purchase it for my Scorpion Evo3 S2 micro SBR mainly to fit in a gray man sling pack for EDC. Optics Planet had about the best selection and great prices around. Shipping was extr...
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1/1 found this helpful
Helpful Positive Review This thing is amazing by Jc, July 6, 2023
The quality is amazing I love that it feels sturdy and locks in palce has a little bit of play after soem use though just tighten down the button you fold it with an Alan key and give it a dot of loctite and it’s perfection the length of pull was per...
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1/1 found this helpful
Helpful Positive Review Nice quality by Shooter McGavin, January 21, 2024
Really nice quality the offset is a lot more comfortable than the street. I just wish I had chosen a longer length the 7.75 is a little short.
2/2 found this helpful
Most Recent Reviews Great product. by LemmyGibbler, July 11, 2023
Thanks to optics planet for the great price and quick delivery of the item! I’m still waiting on the stamp to be able to use it but it arrived fast and looks great. AT3 seems like a really good company with high quality products.
0/2 found this helpful
Read All 5 Reviews

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Product Info for A3 Industries Modular Folding Stock w/ Picatinny 1913 Mount

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These Modular stocks are designed for firearms that already have a rear Picatinny rail. They are available in multiple configurations to customize your stock for just about any application.The hinge can be mounted to fold left or right, and latches in both the open and closed positions. The offset extension arms are available in straight or offset, and in 6 different lengths. The offset extensions allow the user to configure their stock in 4 different setups as shown in the appropriate product images. This allows the user to raise or lower their cheek rest, avoid obstacles like side charging handles or ejection ports, and raise or lower the buttplate.All components are machined from aluminum and anodized low-gloss black.

Our extension arms are available in both straight or offset configurations. Straight extensions simply extend rearward, positioning the stock end in line with the hinge point. Offset extensions offset one end 1.25" from center. Each end is symmetrical, allowing the user to mount it in 4 different positions. These offsets can be used to clear objects such as an ejection port or charging handle, raise/lower a cheek weld for different height optics, or position the brace end higher or lower to suit your shooting preference. 

All extension arms incorporate M-LOK slots along the full length of the arm. This allows the user to mount a QD (Quick-disconnect) sling mount anywhere on the extension, or any other M-LOK accessory. This also allows you to mount the A3 Clamp-on cheek rest CRU-101 or the XENO Adjustable Cheek Riser

Specifications for A3 Industries Modular Folding Stock w/ Picatinny 1913 Mount:

Manufacturer: A3 Industries
Gun Type: Carbine
Gun Make: Universal
Gun Model: Universal
Color: Black
Hand: Ambidextrous
Condition: New
Stock/Brace Material: 6061-T6 Aluminum
Mount Type: Picatinny
Fabric/Material: 6061-T6 Aluminum
Attachment Type: Picatinny

Package Contents:

  • A3 Industries Modular Folding Stock w/ Picatinny 1913 Mount

A3 Industries Modular Folding Stock w/ Picatinny 1913 Mount Orderable Models

List of Orderable Models

A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.25In Offset Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-8.25-OFF-BP2 , MPN: MS-H2-8.25-OFF-BP2 , UPC: 810151874142 , Code: 69H-RSF-MFS13P-MS-H2-8-25-OFF-BP2
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.75In Offset Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-7.75-OFF-BP2 , MPN: MS-H2-7.75-OFF-BP2 , Code: 69H-RSF-MFS13P-MS-H2-7-75-OFF-BP2
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 6.25In Offset Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-6.25-OFF-BP2 , MPN: MS-H2-6.25-OFF-BP2 , Code: 69H-RSF-MFS13P-MS-H2-6-25-OFF-BP2
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 6.25In Straight Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-6.25-STR-BP2 , MPN: MS-H2-6.25-STR-BP2 , Code: 69H-RSF-MFS13P-MS-H2-6-25-STR-BP2
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.25In Straight Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-8.25-STR-BP2 , MPN: MS-H2-8.25-STR-BP2 , UPC: 810151875156 , Code: 69H-RSF-MFS13P-MS-H2-8-25-STR-BP2
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 6.25In Offset Extension Arm, Polymer Butt-Plate With Magpul v1 Rubber Butt-Pad, Black, MS-H2-6.25-OFF-BP3 , MPN: MS-H2-6.25-OFF-BP3 , Code: 69H-RSF-MFS13P-MS-H2-6-25-OFF-BP3
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 6.25In Offset Extension Arm, Polymer Butt-Plate With Magpul v2 Rubber Butt-Pad, Black, MS-H2-6.25-OFF-BP4 , MPN: MS-H2-6.25-OFF-BP4 , Code: 69H-RSF-MFS13P-MS-H2-6-25-OFF-BP4
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.25In Offset Extension Arm, Polymer Butt-Plate With Magpul v2 Rubber Butt-Pad, Black, MS-H2-8.25-OFF-BP4 , MPN: MS-H2-8.25-OFF-BP4 , UPC: 810151871516 , Code: 69H-RSF-MFS13P-MS-H2-8-25-OFF-BP4
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.75In Straight Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-7.75-STR-BP2 , MPN: MS-H2-7.75-STR-BP2 , UPC: 810151873664 , Code: 69H-RSF-MFS13P-MS-H2-7-75-STR-BP2
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.25In Offset Extension Arm, Polymer Butt-Plate With Magpul v1 Rubber Butt-Pad, Black, MS-H2-8.25-OFF-BP3 , MPN: MS-H2-8.25-OFF-BP3 , UPC: 810151875163 , Code: 69H-RSF-MFS13P-MS-H2-8-25-OFF-BP3
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.25In Straight Extension Arm, Polymer Butt-Plate With Magpul v2 Rubber Butt-Pad, Black, MS-H2-8.25-STR-BP4 , MPN: MS-H2-8.25-STR-BP4 , UPC: 810151874920 , Code: 69H-RSF-MFS13P-MS-H2-8-25-STR-BP4
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.75In Straight Extension Arm, Polymer Butt-Plate With Magpul v2 Rubber Butt-Pad, Black, MS-H2-7.75-STR-BP4 , MPN: MS-H2-7.75-STR-BP4 , UPC: 810151875170 , Code: 69H-RSF-MFS13P-MS-H2-7-75-STR-BP4
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.75In Offset Extension Arm, Polymer Butt-Plate With Magpul v2 Rubber Butt-Pad, Black, MS-H2-7.75-OFF-BP4 , MPN: MS-H2-7.75-OFF-BP4 , UPC: 810151871684 , Code: 69H-RSF-MFS13P-MS-H2-7-75-OFF-BP4
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.75In Offset Extension Arm, Polymer Butt-Plate With Magpul v1 Rubber Butt-Pad, Black, MS-H2-7.75-OFF-BP3 , MPN: MS-H2-7.75-OFF-BP3 , UPC: 810151871677 , Code: 69H-RSF-MFS13P-MS-H2-7-75-OFF-BP3
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.75In Straight Extension Arm, Polymer Butt-Plate With Magpul v1 Rubber Butt-Pad, Black, MS-H2-7.75-STR-BP3 , MPN: MS-H2-7.75-STR-BP3 , UPC: 810151874906 , Code: 69H-RSF-MFS13P-MS-H2-7-75-STR-BP3
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 6.25In Straight Extension Arm, Polymer Butt-Plate With Magpul v1 Rubber Butt-Pad, Black, MS-H2-6.25-STR-BP3 , MPN: MS-H2-6.25-STR-BP3 , Code: 69H-RSF-MFS13P-MS-H2-6-25-STR-BP3
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.25In Straight Extension Arm, Polymer Butt-Plate With Magpul v1 Rubber Butt-Pad, Black, MS-H2-8.25-STR-BP3 , MPN: MS-H2-8.25-STR-BP3 , UPC: 810151874913 , Code: 69H-RSF-MFS13P-MS-H2-8-25-STR-BP3
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 6.25In Straight Extension Arm, Polymer Butt-Plate With Magpul v2 Rubber Butt-Pad, Black, MS-H2-6.25-STR-BP4 , MPN: MS-H2-6.25-STR-BP4 , Code: 69H-RSF-MFS13P-MS-H2-6-25-STR-BP4

A3 Industries Modular Folding Stock w/ Picatinny 1913 Mount Unavailable & Discontinued Models

List of Unorderable Models

DEMO, A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.00In Offset Extension Arm, Minimalist Aluminum Butt-Plate, Black, MS-H2-7.00-OFF-BP1 , MPN: MS-H2-7.00-OFF-BP1-DEMO , Code: 69H-RSF-MFS13P-MS-H2-7-00-OFF-BP1-DEMO
DEMO, A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.625In Offset Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-8.625-OFF-BP2 , MPN: MS-H2-8.625-OFF-BP2-DEMO , Code: 69H-RSF-MFS13P-MS-H2-8-625-OFF-BP2-DEMO
DEMO, A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 6.25In Offset Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-6.25-OFF-BP2 , MPN: MS-H2-6.25-OFF-BP2-DEMO , Code: 69H-RSF-MFS13P-MS-H2-6-25-OFF-BP2-DEMO
EDEMO, A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.25In Offset Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-8.25-OFF-BP2 , MPN: MS-H2-8.25-OFF-BP2-EDEMO , Code: 69H-RSF-MFS13P-MS-H2-8-25-OFF-BP2-EDEMO-RE-A
USED A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.625In Offset Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-8.625-OFF-BP2, EDEMO1 , MPN: MS-H2-8.625-OFF-BP2-EDEMO1 , Code: 69H-RSF-MFS13P-MS-H2-8-625-OFF-BP2-EDEMO1
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.25In Offset Extension Arm, Minimalist Aluminum Butt-Plate, Black, MS-H2-8.25-OFF-BP1 , MPN: MS-H2-8.25-OFF-BP1 , UPC: 810151871066 , Code: 69H-RSF-MFS13P-MS-H2-8-25-OFF-BP1
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.625In Offsett Extension Arm, Minimalist Aluminum Butt-Plate, Black, MS-H2-8.625-OFF-BP1 , MPN: MS-H2-8.625-OFF-BP1 , UPC: 810151872032 , Code: 69H-RSF-MFS13P-MS-H2-8-625-OFF-BP1
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.00In Offset Extension Arm, Minimalist Aluminum Butt-Plate, Black, MS-H2-7.00-OFF-BP1 , MPN: MS-H2-7.00-OFF-BP1 , Code: 69H-RSF-MFS13P-MS-H2-7-00-OFF-BP1
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 6.25In Straight Extension Arm, Minimalist Aluminum Butt-Plate, Black, MS-H2-6.25-STR-BP1 , MPN: MS-H2-6.25-STR-BP1 , Code: 69H-RSF-MFS13P-MS-H2-6-25-STR-BP1
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.625In Straight Extension Arm, Minimalist Aluminum Butt-Plate, Black, MS-H2-8.625-STR-BP1 , MPN: MS-H2-8.625-STR-BP1 , Code: 69H-RSF-MFS13P-MS-H2-8-625-STR-BP1
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.75In Straight Extension Arm, Minimalist Aluminum Butt-Plate, Black, MS-H2-7.75-STR-BP1 , MPN: MS-H2-7.75-STR-BP1 , Code: 69H-RSF-MFS13P-MS-H2-7-75-STR-BP1
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.00In Straight Extension Arm, Minimalist Aluminum Butt-Plate, Black, MS-H2-7.00-STR-BP1 , MPN: MS-H2-7.00-STR-BP1 , Code: 69H-RSF-MFS13P-MS-H2-7-00-STR-BP1
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 6.25In Offset Extension Arm, Minimalist Aluminum Butt-Plate, Black, MS-H2-6.25-OFF-BP1 , MPN: MS-H2-6.25-OFF-BP1 , Code: 69H-RSF-MFS13P-MS-H2-6-25-OFF-BP1
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.25In Straight Extension Arm, Minimalist Aluminum Butt-Plate, Black, MS-H2-8.25-STR-BP1 , MPN: MS-H2-8.25-STR-BP1 , Code: 69H-RSF-MFS13P-MS-H2-8-25-STR-BP1
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.75In Offset Extension Arm, Minimalist Aluminum Butt-Plate, Black, MS-H2-7.75-OFF-BP1 , MPN: MS-H2-7.75-OFF-BP1 , Code: 69H-RSF-MFS13P-MS-H2-7-75-OFF-BP1
DEMO, A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.625In Offsett Extension Arm, Minimalist Aluminum Butt-Plate, Black, MS-H2-8.625-OFF-BP1 , MPN: MS-H2-8.625-OFF-BP1-DEMO , Code: 69H-RSF-MFS13P-MS-H2-8-625-OFF-BP1-DEMO
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.625In Offset Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-8.625-OFF-BP2 , MPN: MS-H2-8.625-OFF-BP2 , Code: 69H-RSF-MFS13P-MS-H2-8-625-OFF-BP2
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.00In Offset Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-7.00-OFF-BP2 , MPN: MS-H2-7.00-OFF-BP2 , UPC: 810151871646 , Code: 69H-RSF-MFS13P-MS-H2-7-00-OFF-BP2
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.00In Straight Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-7.00-STR-BP2 , MPN: MS-H2-7.00-STR-BP2 , Code: 69H-RSF-MFS13P-MS-H2-7-00-STR-BP2
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.625In Straight Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-8.625-STR-BP2 , MPN: MS-H2-8.625-STR-BP2 , Code: 69H-RSF-MFS13P-MS-H2-8-625-STR-BP2
DEMO, A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.25In Offset Extension Arm, A3T Aluminum Butt-Plate With Rubber Butt-Pad, Black, MS-H2-8.25-OFF-BP2 , MPN: MS-H2-8.25-OFF-BP2-DEMO , Code: 69H-RSF-MFS13P-MS-H2-8-25-OFF-BP2-DEMO
USED A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.625In Offset Extension Arm, Polymer Butt-Plate With Magpul v2 Rubber Butt-Pad, Black, MS-H3-8.625-OFF-BP4, EDEMO1 , MPN: MS-H3-8.625-OFF-BP4-EDEMO1 , Code: 69H-RSF-MFS13P-MS-H3-8-625-OFF-BP4-EDEMO1
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.625In Offset Extension Arm, Polymer Butt-Plate With Magpul v1 Rubber Butt-Pad, Black, MS-H2-8.625-OFF-BP3 , MPN: MS-H3-8.625-OFF-BP3 , Code: 69H-RSF-MFS13P-MS-H2-8-625-OFF-BP3
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.00In Offset Extension Arm, Polymer Butt-Plate With Magpul v2 Rubber Butt-Pad, Black, MS-H2-7.00-OFF-BP4 , MPN: MS-H2-7.00-OFF-BP4 , UPC: 810151875125 , Code: 69H-RSF-MFS13P-MS-H2-7-00-OFF-BP4
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.00In Straight Extension Arm, Polymer Butt-Plate With Magpul v2 Rubber Butt-Pad, Black, MS-H2-7.00-STR-BP4 , MPN: MS-H2-7.00-STR-BP4 , UPC: 810151874890 , Code: 69H-RSF-MFS13P-MS-H2-7-00-STR-BP4
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.00In Offset Extension Arm, Polymer Butt-Plate With Magpul v1 Rubber Butt-Pad, Black, MS-H2-7.00-OFF-BP3 , MPN: MS-H2-7.00-OFF-BP3 , UPC: 810151875118 , Code: 69H-RSF-MFS13P-MS-H2-7-00-OFF-BP3
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 7.00In Straight Extension Arm, Polymer Butt-Plate With Magpul v1 Rubber Butt-Pad, Black, MS-H2-7.00-STR-BP3 , MPN: MS-H2-7.00-STR-BP3 , UPC: 810151875187 , Code: 69H-RSF-MFS13P-MS-H2-7-00-STR-BP3
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.625In Offset Extension Arm, Polymer Butt-Plate With Magpul v2 Rubber Butt-Pad, Black, MS-H2-8.625-OFF-BP4 , MPN: MS-H3-8.625-OFF-BP4 , UPC: 810151871066 , Code: 69H-RSF-MFS13P-MS-H2-8-625-OFF-BP4
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.625In Straight Extension Arm, Polymer Butt-Plate With Magpul v1 Rubber Butt-Pad, Black, MS-H2-8.625-STR-BP3 , MPN: MS-H2-8.625-STR-BP3 , Code: 69H-RSF-MFS13P-MS-H2-8-625-STR-BP3
A3 Industries Modular Folding Stock, Picatinny 1913 Hinge Mount, 8.625In Straight Extension Arm, Polymer Butt-Plate With Magpul v2 Rubber Butt-Pad, Black, MS-H2-8.625-STR-BP4 , MPN: MS-H2-8.625-STR-BP4 , Code: 69H-RSF-MFS13P-MS-H2-8-625-STR-BP4
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