I'm trying to help my GF put together a cheap Colt SMG clone

>>33419734
If you haven't bought the barrel yet, just buy a longer barrel you jackass.

If you have bought the barrel, you are probably stuck with a fake can. Longest muzzle devices that come to mind are Griffin Armament XM177 and other various other "moderator" clones/knockoffs. However they are almost assuredly for .223, using 1/2x/28 threads at that.

Or just use a pistol tube
>hurr durr


Don't be completely infantile.

>>33419761
Haven't bought anything yet. Just want to build the thing as light as possible and figured that using a short barrel with a pinned flashcan would be the way to go. I want her to be able to shoulder the fucking thing at an indoor range without triggering autistic screeching.

>>33419772
You will need a 13.7(?) barrel for a KX3/KX5

If you can find a moderator clone for 9x19, you will need 12 3/4

14.5 and the world is your oyster

A pistol tube and the world is your oyster

Protip just use """cheekweld""" if you care that much about what everyone thinks at the range

>>33419779
It's not for me though, and I think it would be better for her just to learn proper shooting technique to begin with. Will start looking for a 13.5in barrel.

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Just buy a 16" barrel, dipshit. It's going to be the same length regardless.

If' you're really keen on the short barrel, then build a pistol and sling it Euro-style.

>>33419772
>Just want to build the thing as light as possible

Why, because she's going to be carrying it everywhere?

>>33419859
You're right. She can always get it cut down later if they ever get around to unfucking the NFA or she gets a stamp.

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>>33419859
>sling it Euro-style.

Except half of europe currently has no SBR laws and as such we can get actual folding stocks for our short carbines?

All this pistol brace & pistol sling bullshit originates primarily for the need to bypass US law (and for PSD use).

>>33419870
>All this pistol brace & pistol sling bullshit originates primarily for the need to bypass US law

Sure, but the sling method was popularized by the SAS with the MP5K.

>>33419897
It's not remotely a beginner technique though.