Picked one of these up for the Trracer-ized mag. Figured if I'm going to be using classic mag bodies, it will be easier if I can still use my cocker barrels.
Damned if I forgot to weigh the thing. I'll do it on the next one. It's made out of stainless steel, so there's going to be a weight penalty in exchange for cocker threaded convenience. Also, this thing is meant to be locked into the body via the twist lock pin. It's a great idea, but I think it's somewhat overkill.
(Note: weighed it -- 2.8oz, lol. My DW Fibur is only like 2.1oz w/o an insert.)
Anyways, it's pretty precisely machined. Upon initial inspection, I would have preferred that the threading/bore be cut deeper so that a cocker barrel can sit really far back for better efficiency and less breaks... but as far as efficiency goes, this thing is really cut to fit the bolt pretty tightly, so I don't think that will be an issue. Given how loose other twistlock barrels are, I'd say you might even gain some efficiency.
Whether or not the potential step the ball has to take getting into the barrel is going to be a problem... That will just have to be tested in the field.
Other notes... the edge on the chamber entry was pretty sharp. I smoothed it out a little.
The chamber itself is not as smooth as I would like -- wouldn't do to have the chamber scoring my paint now, would it? Wouldn't want it scuffing up my prized LX bolt either. Bought some 2000 grit sandpaper at the local auto fanatics shop; gonna smooth it up a bit.
Think I would have preferred the o-ring grooves so that the barrel stays in position better, but it's a pretty tight fit so this is probably not a big issue.
Also definitely would have preferred two detents instead of just one, because when that one fails, your gun is totally hosed.
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