+1-800-504-5897 Help Center Check Order Status
About Us Policies Reviews How To
Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.

Enjoy our FREE RETURNS

We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

B5 Systems Modular Platform Stock Up to $10.00 Off and Coupon Available — Free 2 Day Shipping w/ code 2DAYAIR — 5 models

B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Flat Dark Earth, MPS-1554
B5 Systems Modular Platform Stock, Wolf Grey, MPS-1557
B5 Systems Modular Platform Stock, Coyote Brown, MPS-1555
B5 Systems Modular Platform Stock, Od Green, MPS-1556
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Flat Dark Earth, MPS-1554
B5 Systems Modular Platform Stock, Flat Dark Earth, MPS-1554
B5 Systems Modular Platform Stock, Wolf Grey, MPS-1557
B5 Systems Modular Platform Stock, Wolf Grey, MPS-1557
B5 Systems Modular Platform Stock, Coyote Brown, MPS-1555
B5 Systems Modular Platform Stock, Coyote Brown, MPS-1555
B5 Systems Modular Platform Stock, Od Green, MPS-1556
B5 Systems Modular Platform Stock, Od Green, MPS-1556
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
1 of 21 images
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Flat Dark Earth, MPS-1554
2 of 21 images
B5 Systems Modular Platform Stock, Flat Dark Earth, MPS-1554
B5 Systems Modular Platform Stock, Wolf Grey, MPS-1557
3 of 21 images
B5 Systems Modular Platform Stock, Wolf Grey, MPS-1557
B5 Systems Modular Platform Stock, Coyote Brown, MPS-1555
4 of 21 images
B5 Systems Modular Platform Stock, Coyote Brown, MPS-1555
B5 Systems Modular Platform Stock, Od Green, MPS-1556
5 of 21 images
B5 Systems Modular Platform Stock, Od Green, MPS-1556
B5 Systems Modular Platform Stock, Black, MPS-1553
6 of 21 images
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
7 of 21 images
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
8 of 21 images
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
9 of 21 images
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
10 of 21 images
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Flat Dark Earth, MPS-1554
11 of 21 images
B5 Systems Modular Platform Stock, Flat Dark Earth, MPS-1554
B5 Systems Modular Platform Stock, Flat Dark Earth, MPS-1554
12 of 21 images
B5 Systems Modular Platform Stock, Flat Dark Earth, MPS-1554
B5 Systems Modular Platform Stock, Wolf Grey, MPS-1557
13 of 21 images
B5 Systems Modular Platform Stock, Wolf Grey, MPS-1557
B5 Systems Modular Platform Stock, Wolf Grey, MPS-1557
14 of 21 images
B5 Systems Modular Platform Stock, Wolf Grey, MPS-1557
B5 Systems Modular Platform Stock, Coyote Brown, MPS-1555
15 of 21 images
B5 Systems Modular Platform Stock, Coyote Brown, MPS-1555
B5 Systems Modular Platform Stock, Coyote Brown, MPS-1555
16 of 21 images
B5 Systems Modular Platform Stock, Coyote Brown, MPS-1555
B5 Systems Modular Platform Stock, Od Green, MPS-1556
17 of 21 images
B5 Systems Modular Platform Stock, Od Green, MPS-1556
B5 Systems Modular Platform Stock, Od Green, MPS-1556
18 of 21 images
B5 Systems Modular Platform Stock, Od Green, MPS-1556
B5 Systems Modular Platform Stock, Black, MPS-1553
19 of 21 images
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
20 of 21 images
B5 Systems Modular Platform Stock, Black, MPS-1553
B5 Systems Modular Platform Stock, Black, MPS-1553
21 of 21 images
B5 Systems Modular Platform Stock, Black, MPS-1553

Tap Tap to Zoom

Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
Questions & Answers
Customer Reviews
Helpful Positive Review
Close to perfection by Brad, Verified Owner, June 7, 2025
I've tried several different 1913 stocks, and this one is the closest to perfect. There is significantly more adjustable length of pull than I thought there would be, making my gun more comfortable to shoulder. It also has a great weight to counterba...
Read More...
7/7 found this helpful
Helpful Positive Review
compact and solid by Big Red Paper Puncher, Verified Owner, March 14, 2026
Great little 1913 stock! Exactly what I was after, not bulky, plenty of pull ( more than I needed for sure) and the cheek riser is a nice addition. Super easy to install. To fold you just push it towards the ground and voila! Hinge is definitely easi...
Read More...
1/1 found this helpful
Most Recent Reviews
Swing mechanism is not the best by BROSIF, Verified Owner, June 16, 2026
Seemed like a good stock but I returned it because I did not like the swing mechanism. The magpul version is better.
Most Recent Reviews
Awesome Stock from Awesome Company by Marco Romano, Verified Owner, April 3, 2026
B5 makes awesome products that they stand behind. The mechanism on the stock I'd ordered was REALLY stiff, like so stiff that I was having trouble folding it and I called them and within 15 minutes they told me that I have a stock where the mechani...
Read More...
Most Recent Reviews
A must buy by Country boi, Verified Owner, February 14, 2026
Great stock I love it the cheek riser is very comfortable
Read All 5 Reviews
Up to 15% OFF Gun Parts
Free Two Day Shipping
Eligible models will have a savings offer. Apply coupon and add the item to your cart for savings on that select model! Limited time only. Cannot be combined with other promotions or offers. See promotion details.
In Stock
5 Models Available

Show with deals only:

Coupon Available
Free 2 Day Shipping
Color
All
Search

Product Info for B5 Systems Modular Platform Stock

The B5 Systems Modular Platform Stock features an integral left side folding steel hinge, adjustable length of pull, spring assist cheekpiece, ambidextrous fixed and limited rotation quick disconnect sling mounts, and nonslip buttpad. Attaches via 1913 Picatinny mount. Constructed of durable composite materials and steel hardware.image

Specifications for B5 Systems Modular Platform Stock:

Manufacturer: B5 Systems
Gun Type: Rifle
Gun Make: AR Platform
Gun Model: AR-15

Features Of B5 Systems Modular Platform Stock

  • Collapsible Length Of Pull Adjustment
  • Adjustable Spring Assist Cheek Riser
  • Cushioned Nonslip Buttpad
  • Fixed Sling Mounts And Steel Anti-Rotational Qd Mounts
  • Durable Composite Materials
  • Color Matched Steel Hardware
  • Attaches Via 1913 Picatinny Mount

Package Contents:

  • B5 Systems Modular Platform Stock

What firearm models does the manufacturer say B5 Systems Modular Platform Stock is compatible with?

The manufacturer says that B5 Systems Modular Platform Stock is compatible with AR-15

B5 Systems Modular Platform Stock Orderable Models

List of Orderable Models

  • B5 Systems Modular Platform Stock, Black, MPS-1553 , MPN: MPS-1553 , UPC: 814927023604 , Code: 24X-RSC-MPS1553-MPS-1553
  • B5 Systems Modular Platform Stock, Flat Dark Earth, MPS-1554 , MPN: MPS-1554 , UPC: 814927023611 , Code: 24X-RSC-MPS1553-MPS-1554
  • B5 Systems Modular Platform Stock, Wolf Grey, MPS-1557 , MPN: MPS-1557 , UPC: 814927023642 , Code: 24X-RSC-MPS1553-MPS-1557
  • B5 Systems Modular Platform Stock, Coyote Brown, MPS-1555 , MPN: MPS-1555 , UPC: 814927023628 , Code: 24X-RSC-MPS1553-MPS-1555
  • B5 Systems Modular Platform Stock, Od Green, MPS-1556 , MPN: MPS-1556 , UPC: 814927023635 , Code: 24X-RSC-MPS1553-MPS-1556
Compare (0)
1 item has been added
Add at least two items to compare
Last updated 2026-07-10 UTC.