a strange oddity with the latest gen 2 pmag --
that replica colt 605 upper i built when i was testing it the bolt open often failed to hold the mag open on the last shot.
my first thought was -- i got these thermelt $4 mags from SMG -- so that has to be the problem.
later i tried again with the elander e-mag --bolt held open about half the time.
so i checked the lower sure enough the BHO had a couple travel issues.
i took the BHO parts off trimmed the offending pieces to get full travel and re-assembled the BHO in the lower.
this is the results --these mags hold the bolt open on last shot--
troy industrys battle mags, thermelts, c-products , elander e-mags, cmmg 40s, cprod 40s==
D&H about 50% of the time
mag pull gen 1 mags 100%
mag pull gen 2 mags 50% at best--
now here is where the real head spinner kicks in.
the same mags that don't hold the BHO open with this lower work with ALL the other lowers?--
there has got to be something with this lower --but what could be off just enough to cause such goofy things with the BHO?