I have a Bartlein 308 blank. 5r M24 1-10 twist 29". The muzzle has already been threaded 5/8x24 but it can be cut off if you want another thread . I just bought this barrel from here and received it last week. Ive really been wanting a straight 1.250 barrel but couldn't find one anywhere until of course 2 days after I decided to buy this one, bartlein offers one direct from their site so its back up for sale. I paid $360 so with $20 to ship it I'm asking $380 shipped and insured.