The Underfolder 5.25 kit utilizes KAK Industry’s CQC Short Buffer System and any standard
AR15 Bolt Carrier Group/AR Pistol Caliber Bolt.
Folded length is 5.25′′ off the rear of the lower receiver. The Underfolder utilizes an Original
Hungarian AKM Underfolder Stock Assembly and locking mechanism, in *good* condition. The
single push button allows the locking mechanism to release, adding to the security of the stock
in the folded or deployed position. Parts have been previously fitted and may show slight signs
System includes complete stock assembly, receiver extension, short buffer, and flatwire buffer
spring. System weight without buffer is 1LB 10 oz. Underfolder will clear 30 round AR-15
Rifle Caliber Carbine – 2.5oz, Rifle Caliber Heavy – 3.3oz.
Pistol Caliber Carbine – 3.7oz, Pistol Caliber Heavy – 4.6oz, Pistol Caliber H2 – 5.5oz.
*NOTE- this product does not require a shortened AR15 Bolt Carrier Group/AR Pistol Caliber
Bolt, thus no bolt carrier group is sold with this kit.
Compatible with most AR-15s in calibers of: .223, .223Wylde, 5.56, 300 BO, 7.62x39, 6.8 SPC,
6.5 Grendel, .458 SOCOM, 50 Beowulf, 9MM, 45 ACP, and 40 S&W.
The Pistol Caliber Buffers feature an extended design, making them compatible with PCC Bolts
while also increasing reliability and preventing over travel, resulting in an extremely smooth and
highly efficient function.