Help me solve mystery

[Sigequinox220]

Mystery of the 1:5 twist that is!?

I spoke with Troy and they have no idea. They don’t produce a gun w/ 1:5 twist.

from my research there’s only 1 manufacturer of 1:5 AR barrels (forget name).

is this (1) more likely incorrect stamp (how does that happen? Not familiar with manufacturing process) or (2) a alignment of the moons where Troy got a barrel they shouldn’t have and wasn’t caught in QC?

I tried doing the whole tape off cleaning rod thing and had awful reproducibility. Though IIRC it did seem to average around 6, but again was all over place from like 5-10

Really hoping the collective wisdom can figure this out. Chalked up the stamp, nearly says '1/5'

 

[SnowRooster]

Somebody changed the barrel out before you got it?

 

[Pbj ak]

How does it shoot?

 

[Sigequinox220]

I am the first owner. purchased from reputable FFL.

it shoots great (~3k rounds so far) with 55gr and 62gr ammo. No key holing or other aerodynamic aberrations obvious out to 100 yards.

 

[REELDOC]

Ask and ye shall receive. Search-fu is good today. Looks like you have a Green Mountain experimental. In my fog of old age I seem to remember these. Tight as Dick's hatband. Thinner jackets may go poof in gray smoke.

http://www.gmriflebarrel.com/gm-m43-10-5-5-56-nato-caliber-barrel-1-5-twist/

http://www.gmriflebarrel.com/gm-m35...rrel-experimental-1-6-twist-limited-quantity/

 

[Sigequinox220]

Ask and ye shall receive. Search-fu is good today. Looks like you have a Green Mountain experimental. In my fog of old age I seem to remember these. Tight as Dick's hatband. Thinner jackets may go poof in gray smoke.

http://www.gmriflebarrel.com/gm-m43-10-5-5-56-nato-caliber-barrel-1-5-twist/

http://www.gmriflebarrel.com/gm-m35...rrel-experimental-1-6-twist-limited-quantity/

yes, that must have been manufacturer I found previously...barrel is marked 556 not wild.. That 556 is 10.5 inch. Mine is 12 inches.

Let’s just assume they did make a few prototype 12 inch 1:5s. How do you suppose it ended up on a Troy firearm that was NIB?

 

[DickFord]

Did you check the twist rate?


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[SDIVER2006]

I am the first owner. purchased from reputable FFL.

it shoots great (~3k rounds so far) with 55gr and 62gr ammo. No key holing or other aerodynamic aberrations obvious out to 100 yards.

Could it be a 8 and some of the stamp was bad?

 

[BigWaylon]

Could it be a 8 and some of the stamp was bad?

I’d say “no” based on the pic he posted...