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Custom ar barrel extension

1286 Views 1 Reply 2 Participants Last post by  duaxmachine
Hi.I’m new to the forum. I am building a custom ar in 45acp. I am looking at placing a Thompson smg finned barrel on a .458 upper. Does anyone know of a barrel extension with the acme threads that would fit the barrel or someone too modify it to fit. Or do I have the barrel end modified to fit the extension. I am now retired with no access to machines like I use to. I have not found a Thompson style finned barrel that is plug and play. I am also going to fit both the rear and forward hand grips to enhance the look. I tell my wife these are adult Lego kits. (She doesn’t buy into it). Any feedback is appreciated. Thanks,
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It would probably be easier, and not any more expensive to have someone make a finned barrel to fit your upper.
Green Mountain sells .45 barrel blanks, and since the Thompson was a blow-back action, there are already blow-back bolts available off the shelf.
CNC makes a .45 lower that accepts M3 Grease Gun mags.
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