I've seen posts where someone is going to produce barrels in different caliber's but haven't seen any actually for sale ... Of course ultimately I'd like to have the barrel & gas system in one unit ... I suppose that would be a caliber conversion, and they don't seem to exist.
Could you get around the shorter dwell time by expanding the gas port (possibly dramatically)?
Since we're on a piston gun, isn't it a straight shot through the block to the piston? And we're not limited by gas tube diameter, etc.
(On a tangent, how on earth is the MDR-C hoping to accomplish this? Their material says they'll offer the shorty in 300 BLK, but from the pictures it looks like the gas block is basically sitting on the muzzle.)
Not sure, I've not looked into building a 300blk based midlength port, I generally stick with pistol length. I'll look into a couple options for this. No promises that anything will work though.
With that being said, the pictures of the MDR's in your link are probably stock photo's of 5.56 or 308 rifles. They definitely have some 3d printed parts on the lower so those aren't production yet.
Had a look at the ACR gas block, and the gas port is downright cavernous.
The port in my barrel is ~0.0625, and if memory serves, the standard AR gas port is 0.0700; the gas block is a hair over 0.0900.
I almost wonder if they did that with this very problem in mind.
I didn't realize we were talking about a giant 8 foot rifle here. I thought he meant a real length, something 12.5 or down.
You do need a pistol length on a 14.5. But with only running three ways, and opening up the port you may be able to do it with carbine, but it'll likely need way more than .09.
Then it looks like the next step is ordering a 300BLK carbine barrel and a replacement gas block, cutting it down and getting out the drill press
...Any tips on how to convince the wife that's a good idea?
So....I have access to x-ray and shear wave NDT at work. Would it benefit if I were to have the gas block xrayed so we can get an idea of what's going on inside? Anything else I could do this with?
Is Martin's gas block/piston conversion the Adams Arms piston retro fit kit? (that's what came up when I googled it)
If so, yes I had the same thought ... I ordered an AA retro piston kit and a CMMG 16" 300 BO barrel. The height of the gas block in the kit is taller than the one in the ACR so that the piston isn't perfectly parallel to the bolt carrier block and it binds where it passes through into the receiver.
Yes I build them to order. If you want one I can have one built up. Depending on what length you are wanting the prices start at 685 for a complete barrel set.
He is still doing barrel assemblies; looking at the Templar Precision Facebook page it appears that he's been doing a lot of dimpled barrels.
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