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Anyone know of an agency that might have used these? If they have an interesting story I might consider one, but if not I'd buy a new PSA at that price ($500.)
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Personally I would take anything 'older DPMS' than PSA any day of the week.
Curious if you even cracked one of the DPMS rifles that you saw open and looked inside the chamber to see if it was chrome lined or not / what sort of carrier and such?
What exactly was the barrel profile you saw?
There was an awful lot of stuff that DPMS did not do 'in house' and they would send off to others to have done in batches. They did not have the tooling, staff or people to be able to do cryo treating but... They could have it done if you were willing to pay for it. Same with chrome lining. They did not have the stuff to do that 'in house' but if you wanted it done - It was available. They tended to not use shitty companies to help them back in the day when they had to farm stuff out.
Ordered a 7.62x39 upper from them once back in the Randy Luth days and got a complete Colt upper assembly (still in the original Colt box and all with all of that good stuff straight from Colt). They did not 'advertise' any of that stuff being Colt parts at the time but that is what they sent me. Because... They were not set up to do and did not do 7.62 anything for themselves at that time. They 'sold' 7.62 stuff that they sourced from elsewhere.
Those same places that did that cryo treating and chrome lining for them back in the day are
still around. :) (DPMS is obviously not)
Depending on the details of the barrel I may have jumped on a few of those if I had seen them locally for that cheap. I would have definitely looked (cracked it open and actually looked inside) if I saw something like you saw in a local store for that price.