send the non-working 1 back.. keep the working one..
my PSA 16" upper ran like a machine.. 100% with 0 issues..
the only CS issues
lately besides small missing parts, have been the lack of shipping notices when your order ships..
not so bad, but if you've got 2000 rounds of ammo coming in... I'd like to know what day so I don't have my 70yo mom hefting it into the house..
don't expect any CS during a sale.. just order and wait.. don't be in a RUSH to build..
overall, PSA has worked VERY well for me and several others...
if I were to sell lets say 2000 'epsgunner' uppers in like 4 days.. and other parts too.. heck yeah.. your gonna wait brother..
these CS issues with PSA pop-up like once every 2-3 weeks..
they should have however responded sooner.. either with email or a call back..