Quoted: It is indeed as you said -- I would call the sliding feel to be "rough", as opposed to smooth.
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Thank you so much fror checking and posting sir...can't tell ya how much I appreciate it and I'm now officailly calling...."BINGO!!!"
I say it's the resultant combination of three things...
1. The inherent yet slight tuning sensitivity of the carbine short gas system coupled with...
2. The "softer loadings/lower chamber pressures" of 55gr. Blackhills Blue Box ammo
and ultimately?...and the straw that broke the bushmasters back?...
3. Rough BC internals imparting increased amounts of "Statis Hystersis" (read: frictional resistance) in the BCG.
stir gently and viola...FTEX...and/or...Weak Ejection...gas pulse got ate up trying to unlock the sticky, resistant BCG.
and this is not to say that one might not be better served with a stronger XP extractor spring or by adding an O-ring or shooting higher chamber pressured 62gr ammo as....you would...but it is nothing more than an "affective band-aid" and not the resolving or addressing the primary root cause...which is now officially in my humble and most modest opinion highly attributable to....
"Rough/Sticky Internals Inside The BCG."
Can I get an amen? LOL!!!
Thanks again jkstexas and...L8R, Bill.