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8/31/2026 6:36:18 PM EDT
So after picking up a PTR-91 I decided to start my G3 build. I currently have most of what I need including a surplus barrel.

Considering which way to go on this one. I love the PTR but thinking of a shorter build to make it a bit handier.

So my question for the hive is 14ish inch build is a little easier since I can shorten the barrel I have and use the existing cocking tube, and keeps the long sight radius vs the 12.5” is shorter but a little more work. Ballistically there probably isn’t much difference 12 vs 14 and I don’t want anything shorter as if I want a flamethrower I will purchase one.

So any suggestions would be appreciated.
8/31/2026 7:16:59 PM EDT
[Last Edit: LeviBarAlphaeus][Edited] [#1]
If it isn't 12.5 (12.69" is technically correct), it isn't a G3k.

Go 12.5".
8/31/2026 7:55:45 PM EDT
[#2]
I like the look of the shorter barrel. I guess a few extra bucks for the 12.5 is a small price to pay for the extra compactness.
8/31/2026 8:03:34 PM EDT
[#3]
12.5 or bust Attached File
8/31/2026 8:07:56 PM EDT
[#4]
A couple of smiths used to chop the barrel to do a 16” fake K.

I agree with the above. Do it right… 12.5” or 12.69”.

I snagged a K3P as a stripped barreled receiver a few years back and planned to SBR it.

Can’t find my G3K rear sight drum!
9/1/2026 7:38:11 AM EDT
[#5]
Quote History
Originally Posted By LeviBarAlphaeus:
If it isn't 12.5 (12.69" is technically correct), it isn't a G3k.

Go 12.5".
View Quote


This.
9/1/2026 8:24:39 AM EDT
[#6]
View Quote


This is the look I want. Love my full size, but the short one just sings, not to mention the full size is a little long to hunt with from a tree.
9/1/2026 9:20:50 AM EDT
[#7]
Now with more political fatigue.
9/1/2026 2:35:22 PM EDT
[#8]
Quote History
Originally Posted By osprey21:
https://i.postimg.cc/8zmkTwPK/G3k.jpg
View Quote




Attached File
9/1/2026 3:37:56 PM EDT
[#9]
I've always wanted one of the 12.5" G3K guns and will eventually get one.  I almost pulled the trigger on buying one, but a POF 12.5" small frame .308 popped up cheap, so it went home with me.  The POF was nearly half the money, so it was a no brainer.

I used to have a full sized PTR-91 that had the barrel chopped to 14.5" and the flash hider pinned to make it 16" OAL.  I really liked the gun and how long the sight radius was.  I won't say it was a handy rifle, but it did handle well for its weight.  Something new got my attention and it got traded off.  It was shortly after the 12.5" guns came out, so I knew I'd eventually get one of those.  The G3K keeps getting knocked to the back of the list as I keep getting a deal on something.
9/2/2026 11:02:09 AM EDT
[#10]
I got one of the PTR K3P PDW Pistol and SBR'd it.  The thing is stupid fun and throws some great fireballs.  
9/2/2026 11:16:15 AM EDT
[#11]
I found a PTR91 K3P Pistol and built this 12.5" G3K clone last week, shoots great!  12.5" is the way!


9/3/2026 5:25:47 PM EDT
[#12]
Just when I think I’m out, they pull me back in.

12.5” it is. Now off to find a 4 position A3 stock that won’t cost me my virginity.

This place has been costing me money in a good way for almost two decades.

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