I've had 7.62X25 ARs for some time. The first was a blowback I got back in 2002 -- I still have that and it's a good work horse. My second was a DI Tok AR with a pistol length system. I got that back in 2005 and it was actually for a version of a Mini-whisper so it was used with hand loads. My new one is the more modern type with the short gas system and it shoots great. I started out with an A2 upper receiver on it but it shot so well I decided to put the DSA blem upper I got (thanks to this site) and added a scope to see what it could really do.
I have not had a chance to shoot it since I added the scope but if it shoots like the mini-whisper it should be one hole groups. I forgot to say the magazine is a CZ-24 that I use for some other rounds based on the 7.62 Tok. One of those rounds is the 22 Reed Express. I use the PPS mags in the blowback version but I do have a PPS magblock for the DI version also.