I made this thread on M4 Carbine last night but only got 1 reply. I ordered two Surefire FH556-212A flash hiders in the group buy, and have a question about rifle accuracy after re-profiling a barrel and attaching a new flash hider. I currently have a CMMG M4 SOCOM profile 14.5" upper; if I sent it in to have the Phantom cut off, Surefire permanently attached, and the barrel tuned down to a regular M4 (or even lightweight) profile, would that affect the accuracy of the rifle? I am quite pleased with the way this rifle preforms (for those of you familiar with Zombie Targets I put 10 rounds in one of the corner silhouettes @ 100yds my first time shooting that distance) and if there would be a significant change in its shooting I might reconsider the process. I would assume that the accuracy would not be affected granted I got the work done by a reputable smith, but I would like some more input. No thread is complete without pictures: Rifle in question: Surefire FH: Thanks guys!