Bob Thompson
New member
Has anyone had the experiance where their FN or L1A1 would not cycle certain ammo until warmed up from firing a couple of magazines. My Century L1A1 only clcles properly after about 30 rounds fired. Gas port has to be on number 1 to even cycle, then as the rifle warms up gas port can be turned to a higher number. A friend with a similar rifle has had the same experiance. What gives? Does piston swell after several rounds to better seal. All other variables accounted for. Lube, free bolt, good ammo, etc. Help! Bob