I have a 2 Uppers with Shaved FSB 14.5 Colt Socom Barrels & older 9" Heavy SWS/Noveske Rails w/ AAC 51T Blackouts that are Pinned & welded. I'm thinking about cutting one or both of these down to the M203 Barrel Step to put on a Pistol Lower(s) w/ KAK Shockwave(s) for use as PDW's. I plan on running the Upper(s) both Suppressed & Unsuppressed.
So, what is the optimal barrel length to operate with the KAK Receiver Tube and not open up the Gas Ports. KAK RE uses a Carbine spring & buffer I believe. Maybe it might not be worth the time & expense to send the Uppers out. I Might be better off just selling the upper & getting a BCM ELW 11.5. Also, who would you guys recommend to do the job right & not butcher my Uppers. Thanks!