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I think the lovely gents at https://www.nwcustomparts.com would be my first place to contact. I believe they do 300 BLK aswell as .223

"That looks suspiciously like the desecrated remains of a Mosin Nagant bolt body........."

Not sure the previous owner would have access to that sort of thing, I just thought he had made it up.
Whatever it is , it works a treat

Stubby side charger can work well for a lefty.

If I was looking for an AR straight pull (I used to own a Steyr AUG, but don't hold that against me!), I would be looking at Lantac (https://www.lannertactical.com/), Valkyrie Rifles (https://www.valkyrierifles.net/) or Bradley Arms (http://www.bradleyarms.co.uk/). Lantac does seem to be a long wait for anything if what you read is correct, therefore, seems to be between Valkyrie Rifles or Bradley Arms. Both appear to have excellent competition results.

WelshShooter wrote:Don't forget 300 blackout! You can convert 223/5.56 cases to 300blk and there's plentiful supply of 30cal bullets on the market, and can be shot subsonic. Probably a cheaper alternative to 458 SOCOM.

There's also .50 Beowulf which Low Mills Range sell.

I'm opting for 9mmP for my next straight pull.