Name: A3 Industries Universal Picatinny Mount - Modular Telescoping Stock
Brand: A3 Industries
SKU: 69H-RK-UPMM
Price: 237.45 USD
Availability: InStock
Rating: 4.6 (5 reviews)

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Rubber Buttpad, Black, 7.00in, MTS-PIC-7.00-BP2

Government Export Restriction

This item may be regulated for export by the U.S. Department of State or the U.S. Department of Commerce. Please see our Export Policy prior to placing your order.

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Questions & Answers

Will this fit a MPA 30T with the right butt plate?

Yes, A3 even has pictures of that exact setup on their website.

by Zack, Verified Owner, April 9, 2025

Will this fit a Strike Industries SMC P320 chassis? Expert Answer

Yes, the A3 Tactical Universal Picatinny Mount - Modular Telescoping Stock will attach to the 1913 interface found on the back of the SMC P320 Chassis.

by Ethan, Gear Expert, January 26, 2023

View All Q&A You Have a Question? Ask!

Customer Reviews

Helpful Positive Review

Good stock for H&K SP5K by NotMyRealName, Verified Owner, January 24, 2025

I bought this for my H&K SP5K PDW. It fits great, and the folding mechanism is not difficult to operate.

1/1 found this helpful

Helpful Positive Review

rock solid by Clammer6060, Verified Owner, February 28, 2023

Very well made, like all there products, it fits perfect and locks up tight, perfect addition on a montgo 9 with piccitinny adapter, just be sure to use the small piccitinny insert so the set screws lock up tight against it and i recomend using lockt...
Read More...

3/3 found this helpful

Most Recent Reviews

A3 Industries Modular Telescoping Stock by Brendan, Verified Owner, April 14, 2026

Solid product but still lightweight, seems very well made hard use and training will see if it lasts, so far I am very happy

Most Recent Reviews

Almost perfect by Plink-182, Verified Owner, February 6, 2026

Put it on a Ruger PC Carbine takedown. Only thing I don't like about it is the release mechanism. It feels rough and requires way more force to unlock and collapse than it could.

Most Recent Reviews

Great stock/brace !! by Bill, Verified Owner, February 5, 2025

Really pleased with my purchase. Performs exactly as I would expect for my SBR

Read All 5 Reviews

Show In Stock Only

9 Models Available

Length

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Additional Features

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A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Rubber Buttpad, Black, 7.00in, MTS-7-00-BP2

Length:: 7 in
Additional Features:: Rubber Buttpad

Code: 69H-RK-UPMM-MTS-7-00-BP2

MPN: MTS-7.00-BP2

UPC: 810151875088

List: ~~$249.95~~Save $12.50

$237.45

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Rubber Buttpad, Black, 8.75in, MTS-8-50-BP2

Length:: 8.75 in
Additional Features:: Rubber Buttpad

Code: 69H-RK-UPMM-MTS-8-50-BP2

MPN: MTS-8.50-BP2

UPC: 810151870854

List: ~~$249.95~~Save $12.50

$237.45

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Rubber Buttpad, Black, 9.50in, MTS-9-50-BP2

Length:: 9.5 in
Additional Features:: Rubber Buttpad

Code: 69H-RK-UPMM-MTS-9-50-BP2

MPN: MTS-9.50-BP2

UPC: 810151870861

List: ~~$249.95~~Save $12.50

$237.45

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 1 Rubber Buttpad, Black, 9.50in, MTS-9-50-BP3

Length:: 9.5 in
Additional Features:: Magpul 1 Rubber Buttpad

Code: 69H-RK-UPMM-MTS-9-50-BP3

MPN: MTS-9.50-BP3

UPC: 810151872063

List: ~~$299.95~~Save $10.00

$289.95

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 2 Rubber Buttpad, Black, 9.50in, MTS-9-50-BP4

Length:: 9.5 in
Additional Features:: Magpul 2 Rubber Buttpad

Code: 69H-RK-UPMM-MTS-9-50-BP4

MPN: MTS-9.50-BP4

UPC: 810151875071

List: ~~$299.95~~Save $10.00

$289.95

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 2 Rubber Buttpad, Black, 8.75in, MTS-8-50-BP4

Length:: 8.75 in
Additional Features:: Magpul 2 Rubber Buttpad

Code: 69H-RK-UPMM-MTS-8-50-BP4

MPN: MTS-8.50-BP4

UPC: 810151874845

List: ~~$299.95~~Save $10.00

$289.95

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 1 Rubber Buttpad, Black, 8.75in, MTS-8-50-BP3

Length:: 8.75 in
Additional Features:: Magpul 1 Rubber Buttpad

Code: 69H-RK-UPMM-MTS-8-50-BP3

MPN: MTS-8.50-BP3

UPC: 810151871110

List: ~~$299.95~~Save $10.00

$289.95

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 2 Rubber Buttpad, Black, 7.00in, MTS-7-00-BP4

Length:: 7 in
Additional Features:: Magpul 2 Rubber Buttpad

Code: 69H-RK-UPMM-MTS-7-00-BP4

MPN: MTS-7.00-BP4

UPC: 810151875064

List: ~~$299.95~~Save $10.00

$289.95

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 1 Rubber Buttpad, Black, 7.00in, MTS-7-00-BP3

Length:: 7 in
Additional Features:: Magpul 1 Rubber Buttpad

Code: 69H-RK-UPMM-MTS-7-00-BP3

MPN: MTS-7.00-BP3

UPC: 810151874869

List: ~~$299.95~~Save $10.00

$289.95

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Product Info for A3 Industries Universal Picatinny Mount - Modular Telescoping Stock

The Modular Telescoping Stock (MTS) features minimalist design elements to keep it ultra light and compact. When fully collapsed the stock only adds 2.00" to the overall length of your firearm. All mounting components are machined from 6061 aluminum and all non-stress areas are profiled to minimize weight without compromising strength. The rods used for telescoping the stock are manufactured from sturdy 3/8" steel and Melonite-coated for ultra wear resistance and rust prevention. With a Picatinny (1913) moounting interface, it will attach to any firearm with a rear Picatinny rail. The MTS stock can be mounted in two different vertical positions, 1" apart, by flipping the mount over. This is helpful when trying to avoid ejection ports or charging handles, and can also position the stock higher or lower for different sight pictures.

Specifications for A3 Industries Universal Picatinny Mount - Modular Telescoping Stock:

Manufacturer:	A3 Industries
Color:	Black
Stock/Brace Material:	6061 Aluminum
Finish:	Melonited
Gun Model:	SIG Sauer MPX
Gun Make:	SIG Sauer
Condition:	New
Weight:	9.3 oz

Features of A3 Industries Universal Picatinny Mount - Modular Telescoping Stock

Only adds 2.00" to overall length when using shortest buttplate (minimalist)
Lightest telescoping stock in the market
Easy push-button release with 3 or 4 length settings, depending on rod length chosen
In most applications, firearm can be fired when stock is fully collapsed
Entire stock can be flipped to provide A 1" Vertical offset
Choice of 4 different buttplates
Choice of 3 different rod lengths
Applications for bufferless AR, B&T APC, B&T GHM, CZ Scorpion, CZ Bren 2, HK MP5/SP5, Hk MP5-K/SP5-K, Grand Power Stribog, And Mac 11/20

Package Contents:

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock

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A3 Industries Universal Picatinny Mount - Modular Telescoping Stock Orderable Models

List of Orderable Models

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Rubber Buttpad, Black, 7.00in, MTS-7-00-BP2 , MPN: MTS-7.00-BP2 , UPC: 810151875088 , Code: 69H-RK-UPMM-MTS-7-00-BP2
A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Rubber Buttpad, Black, 8.75in, MTS-8-50-BP2 , MPN: MTS-8.50-BP2 , UPC: 810151870854 , Code: 69H-RK-UPMM-MTS-8-50-BP2
A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Rubber Buttpad, Black, 9.50in, MTS-9-50-BP2 , MPN: MTS-9.50-BP2 , UPC: 810151870861 , Code: 69H-RK-UPMM-MTS-9-50-BP2
A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 1 Rubber Buttpad, Black, 9.50in, MTS-9-50-BP3 , MPN: MTS-9.50-BP3 , UPC: 810151872063 , Code: 69H-RK-UPMM-MTS-9-50-BP3
A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 2 Rubber Buttpad, Black, 9.50in, MTS-9-50-BP4 , MPN: MTS-9.50-BP4 , UPC: 810151875071 , Code: 69H-RK-UPMM-MTS-9-50-BP4
A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 2 Rubber Buttpad, Black, 8.75in, MTS-8-50-BP4 , MPN: MTS-8.50-BP4 , UPC: 810151874845 , Code: 69H-RK-UPMM-MTS-8-50-BP4
A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 1 Rubber Buttpad, Black, 8.75in, MTS-8-50-BP3 , MPN: MTS-8.50-BP3 , UPC: 810151871110 , Code: 69H-RK-UPMM-MTS-8-50-BP3
A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 2 Rubber Buttpad, Black, 7.00in, MTS-7-00-BP4 , MPN: MTS-7.00-BP4 , UPC: 810151875064 , Code: 69H-RK-UPMM-MTS-7-00-BP4
A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 1 Rubber Buttpad, Black, 7.00in, MTS-7-00-BP3 , MPN: MTS-7.00-BP3 , UPC: 810151874869 , Code: 69H-RK-UPMM-MTS-7-00-BP3

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock Unavailable & Discontinued Models

List of Unorderable Models

USED A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Rubber Buttpad, Black, 9.50in, MTS-PIC-9.50-BP2, EDEMO2, Condition Fair, Used , MPN: MTS-PIC-9.50-BP2-EDEMO2 , Code: 69H-RK-UPMM-MTS-PIC-9-50-BP2-EDEMO-US-D
USED A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Rubber Buttpad, Black, 9.50in, MTS-PIC-9.50-BP2, EDEMO1, Used, Condition Fair , MPN: MTS-PIC-9.50-BP2-EDEMO1 , Code: 69H-RK-UPMM-MTS-PIC-9-50-BP2-EDEMO1
A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/No Buttpad, Black, 8.75in, MTS-PIC-8.75-BP1 , MPN: MTS-PIC-8.75-BP1 , Code: 69H-RK-UPMM-MTS-PIC-8-75-BP1
A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/No Buttpad, Black, 7.00in, MTS-PIC-7.00-BP1 , MPN: MTS-PIC-7.00-BP1 , Code: 69H-RK-UPMM-MTS-PIC-7-00-BP1
A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/No Buttpad, Black, 9.50in, MTS-PIC-9.50-BP1 , MPN: MTS-PIC-9.50-BP1 , Code: 69H-RK-UPMM-MTS-PIC-9-50-BP1
DEMO, A3 Industries Universal Picatinny Mount - Modular Telescoping Stock w/Magpul 2 Rubber Buttpad, Black, 9.50in, MTS-PIC-9.50-BP4 , MPN: MTS-PIC-9.50-BP4-DEMO , Code: 69H-RK-UPMM-MTS-PIC-9-50-BP4-DEMO

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A3 Industries Universal Picatinny Mount - Modular Telescoping Stock Up to $12.50 Off w/ Free S&H — 9 models

Product Info for A3 Industries Universal Picatinny Mount - Modular Telescoping Stock

Specifications for A3 Industries Universal Picatinny Mount - Modular Telescoping Stock:

Features of A3 Industries Universal Picatinny Mount - Modular Telescoping Stock

Package Contents:

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock Orderable Models

List of Orderable Models

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock Unavailable & Discontinued Models

List of Unorderable Models

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A3 Industries Universal Picatinny Mount - Modular Telescoping Stock Up to $12.50 Off w/ Free S&H — 9 models

Product Info for A3 Industries Universal Picatinny Mount - Modular Telescoping Stock

Specifications for A3 Industries Universal Picatinny Mount - Modular Telescoping Stock:

Features of A3 Industries Universal Picatinny Mount - Modular Telescoping Stock

Package Contents:

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock Orderable Models

List of Orderable Models

A3 Industries Universal Picatinny Mount - Modular Telescoping Stock Unavailable & Discontinued Models

List of Unorderable Models