I bought a CMMG Piston AR-15 about a year and a half ago and have had no problems with its operation but I was looking on the CMMGINC.COM website and saw on a parts list that my gun comes with a bolt spring... I do not and have not ever had one of these items in my firearm. Is this thing necessary?
Any suggestions?
http://www.cmmginc.com/pdfs/piston-kit.pdf
Any suggestions?
http://www.cmmginc.com/pdfs/piston-kit.pdf