"KWA. 'Nuf said. Seriously though, if you aren't worried about flashyness or whether people like the looks of your weapon but rather are more concerned with how your CQC rifle out performs standard custom field guns straight out of the box, the KWA KM4 series gun is the only gun you should ever consider buying. Whether it's this beautiful SR7 or an SR5 or their new sportline CQR MOD 1 or 0, you will never go wrong with buying a KWA. Known for reliability and performance, the SR7 DEVGRU is simply another member to a long line of tradition paired with modern technologies bringing you to the realization that with KWA, you get what you pay for. The differences between the SR7 and the DMR platform SR10 lay in both size of externals and cylinder venting. This gun is designed specifically for CQB; to be a CQB gun it needs to have an energy output with .20 gm bbs of less than 1.145 Joules (about 345 fps). So KWA put a rear high vent cylinder in this gun to reduce power but maintain consistency. The RIS on the SR7 is a 7" free float picatinny metal rail that reduces overall length and weight while still maximizing versatility, mobility and personilzation. Performance is what we asked for; KWA answered with the KM4 SR7 DEVGRU."