I have a sig 516 that I bought in 2013. Since I bought it I have probably put about 1000 rounds through it and have had issues with FTF FTE Double feeds and bolt not locking to the rear when mag is on empty... I just recently got an RMA number from sig and sent the rifle in but was wondering if...

Besides a grenade launcher is there an optional mount with a pic rail made by someone for a flashlight or bipod?