WOW, WOW, WOW!!!
I got no failures, no hammer follow and groups were AMAZING! This is with my Bassett scope mount, Zeiss Conquest 3-9x50 and with the scout handguard rail installed.
After I warmed up the rifle with some plinker ammo (which was grouping around 1.7" to 2"), I switched over to my last batch of 125gr TNT's that I did my M1A accuracy testing with Bfoosh006. After using 5 rounds to get the scope dialed in for that round, I shot the remaining 10 rounds in 5-shot groups which measured 1.245" and 0.825"!
After I ran out of that batch, I ran another batch of brass which was 4x fired brass which I had just annealed. I shot five 5-shot groups which measured 1.286", 0.807", 1.322", 1.468" and 1.323".
I then ran a quick 5-shot group of 168gr FGMM which measured 0.984"
So that's eight consecutive 5-shot groups all under 1.5"! That's an average group size of 1.1575"!
Rifle configured as such...
Oh, and I still have to install the M14.CA CASM and pay a visit to our friends at Leupold and see what they have for me.
Also, this is a standard M1A with a GI H&R barrel dated from 1962. Gas cylinder is GI and shimmed, not unitized, no NM spring guide either.
I have yet to mess with the tensioner screw on the op rod guide. I used the recommended settings.
Also, a trigger shoe will help. I have one from H2O man and will install it before my next outing.