USP40 1 Posted July 31, 2011 Report Share Posted July 31, 2011 Guys , If I cut down my AK barrel and then have muzzle brake welded on to legal 16" total length . Do I need to enlarged the port? Thanks Quote Link to post Share on other sites
Salmonking 149 Posted July 31, 2011 Report Share Posted July 31, 2011 Just assuming here, but since it's an impulse activated gas system, it's not about gas building up over time that drives the piston; it's the large burst of gas over a short space of time that drives the action. I wouldn't really see a problem unless you cut the barrel to the base of the gas port. But that's just me talking out of my ass lol. Quote Link to post Share on other sites
USP40 1 Posted August 1, 2011 Author Report Share Posted August 1, 2011 Thanks Salmonking . I have plan to put this muzzle brake on the end of the BBL. Quote Link to post Share on other sites
BuffetDestroyer 969 Posted August 3, 2011 Report Share Posted August 3, 2011 If you are only cutting an inch or two, you should be alright especially with the back pressure of the krink style brake. If you are cutting more than 3", you will likely want to put a shorter gas system length, similar to the Draco or AMD65. This will also require the barrel to be turned down to accept the gas block in the new location and the front sight in the new location. FYI, You can buy a new chrome lined U.S. 14.5" barrel from Arms of America for the AMD 65 and get a shorter piston and the AMD 65 gas block for less than $150. This will save the necessary re-profiling and welding up of any previous gas ports and you can realistically cut it down to 12" without worry. Also keep in mind of the NFA implications on cutting down the barrel if the barrel is still attached to the weapon. Quote Link to post Share on other sites
TX-Zen 287 Posted August 5, 2011 Report Share Posted August 5, 2011 Thanks Salmonking . I have plan to put this muzzle brake on the end of the BBL. That's not a brake, actually it's a booster. It increases back pressure to help short barrelled AK's cycle correctly, but is mainly for full auto shooting. The AKSU cone booster does the same thing and also increases back pressure to help keep it from stalling on FA. Z 1 Quote Link to post Share on other sites
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