Let's see if GHK will impress Reapers Airsoft, one of the most comprehensive reviewers on YouTube, with the M4 SOPMOD 14.5" Gas Blowback Rifle... "Moin, little review of the GHK M4 GBB in the Sopmod version (technically identical to MK18, Keymod, Colt, CQB-R). Since I've hardly dealt with GBB long guns for about 2 years, there are certainly points in this review that can be improved by experienced players. Please use the comment field here."