(S)keletonized(T)ube(7)inches long- NO MOUNT INCLUDED

This M4 tube adapter replaces the standard buffer tube to ensure the stock folds as flat as possible! (With proper folding adapter)

Fits most mil-spec M4 style stocks/braces*

Lightweight and Rigid

• Integrated QD Sling Sockets, access with stock completely collapsed
• 7” Length - LOP approximately 8-11.35 inches 
• Compatible with SIG folding mechanisms
• 7075 T6 Aluminum
• Type III Hardcoat Anodized
• Allows 2 bolt installation on MRKT folding mech for ultimate strength

This is not compatible with firearms that need a buffer tube to function

*Some M4 style stocks use tension tabs designed for standard buffer tubes to mitigate movement. These will work on our Skeletonized Tubes however you may experience some wiggle. 

Requires a mount or folding mech to install!

Attaching a stock to a pistol makes it an SBR and requires NFA approval. You are responsible for knowing and following your local/state/federal laws!

JMac Customs LLC is not responsible for the end users misuse  of our products.

SM-4.5 adapters utilize the factory rear trunnions and eliminate the need for additional adapters or folding mechs. 

This version of the SM stock/brace adapter is specifically made for 4.5mm pin folding stocks. 4.5mm trunnions can be found in the SLR 104/106/107 UR/CR/FR. This stock adapter, like the rest of the SM line, will allow you to install all of our Arm Bar and Stocks as well as SIG style stocks. Cheek wield is adjustable by moving the stock/brace up or down on the adapter.

• 2 height positions
• Compatible with all of our SS/AB/ST options as well as SIG stocks
• 7075 aluminum
• Black hardcoat anodize finish
• Includes mounting bolt for lower hole

*May require fitting on Palmetto State Armory 4.5mm trunnions.

*Does not lock in the folded position. (See RSA-4.5 + FM-SM-1913 Folding Mech if you require your stock/brace to lock when folded)