Theres no markings. The only marking on the reciever is on the left side you can see it in the pic its a line l.
IM sure its a 1-9 twist just from shooting it. I have run only 55 gr. ammo through it. Most of its life its had PMP. I shot about 100 rounds of 55 gr. wolf through it to see if it would function and it did.
I had a bushamster bolt and carrier in it and never had one problem from this other than abad magazine here and there.
I had a holo sight on it and it was damn nice shooter.
I have 2 uppers this one im selling for either extra cash or possibly trades for?
I took this off my lower and took the sights off and handguards and my sling to see if I could raise a few bucks.
It doesnt come with a bolt or carrier.
I dont get email notices when someone posts or sends me an IM. I try to check my ad every day but it might be a while.