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2/16/2025 11:33:38 AM EDT
[Last Edit: kanjen95][Edited]
I have a picture of a build I want to try but before I go for it, Id really appreciate any input from the pistol gurus that might save me grief or unnecessary expenditure. The biggest question is the barrel.

The build will be a Colt 601 themed retro pistol,  using a raw slabside lower and one of the raw mayhem machine uppers. Im going for an almost totally raw weathered and buffed look. If I cant find 4" triangle handguards I will make them or have some made.

The current idea that I am chasing involves turning down a 16" pistol gas 300blk barrel (or maybe a 5.56) to a 601 pencil profile forward of the FSB and chopping it to roughly 11.5" total length so that it can take a bayonet.

Anyone ever turned a 300blk barrel down to .560-ish OD?
Anyone know of a 12+ inch pistol gas 5.56 barrel?

ETA: found one answer here regarding POI change and the need for a heavier barrel to support a suppressor Here

May just need to cut a 20" 5.56 barrel down and totally reprofile it
2/16/2025 7:01:29 PM EDT
[#1]
I just ordered a 5.56 Government Profile 11.5" from Ballistic Advantage (AERO).
That might be a simpler route to your destination.

Bob R
2/16/2025 8:29:05 PM EDT
[#2]
Find a gunsmith blank from green mountain or sarco and have Paladin profile, chamber and park it.
2/17/2025 2:48:14 PM EDT
[#3]
Thanks, I figure i'll just have a used 20" barrel I already have cut down for expedience sake  but havent decided. May be worth just buying a new bare barrel.
2/17/2025 2:51:40 PM EDT
[#4]
Quote History
Originally Posted By BobR1:
I just ordered a 5.56 Government Profile 11.5" from Ballistic Advantage (AERO).
That might be a simpler route to your destination.

Bob R
View Quote

Yessir, thanks, but the gas hole is in the wrong place on those!  Pistol length gas hole, but 11.5
2/22/2025 11:45:11 PM EDT
[#5]
A couple of rubber ducks.
The upper one had a vp 12 barrel with a cast fsb that I attempted to salvage. The barrel was unfortunately cut off through the chamber area and had a 5/16 rebar welded to the underside of it.  I salvaged the FSB, added a clamp on fsb and reassembled it as this thing.

This configuration barrel is what I want to have on my next pistol build, still debating 300blk or 5.56.

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