What is required to LEGALLY transform a HK91 PDW into a regular HK91 with collapsable stock or fixed stock (assuming I can get barrel length > 16").
I don’t have a lot of background with the HK91, but there is one locally on the cheap, and if its feasible, it would be nice to swap back to a rifle.
Is this a real HK91 that has been shortened?
I would avoid rebuilding it or buying this. Who knows what parts you are going to get or how shitting the PDW build was.
Just get a factory HK91.
Why do that?
To be a PDW it is already a registered SBR.
Unless of course you are actually looking at a PTR pistol. And if you are just get a PTR GI rifle for about the same price.
What’s your opinion of the PTR GI? Any glaring flaws?
Its a pistol-style. No stock. Non NFA-my apologies, i am just repeating the marketing.
Looking at this as a mini project. The pistol is a bit underpriced.
Assuming it is a PTR and not a 91 converted to a pistol they go for around $999 or so during normal times. Given that you can buy a PTR rifle for about the same amount of money makes converting the pistol to a 16" barrel rifle not terribly practical or cost effective.
I don’t haven enough experience with them to say. But since the pistol in question is almost certainly also a PTR there will be little difference between the two.
I have been told the GI barrel PTRs are an improvement over earlier rifles.
It would cost more to buy a PTR pistol and make it into a rifle, than to just buy a PTR rifle.
Did HK import 91’s in a pistol config? If so that would be news to me.
Never. And now that you mention it I don’t think you can legally go from rifle to pistol, the receiver has to be designated as a pistol from the beginning.
Edit: Nevermind, I’m apparently dyslexic.
It sounds like it could be either a PTR or an early Vector of Utah build. IIRC the Vector guns had PTR receivers or were made entirely by PTR for Vector. The butt-cap is flat with a sling swivel. The PTR pistols generally have an elongated angled butt-cap. My experience is with the Vector gun, and build quality is excellent. Runs great and is fun to shoot with a cut-down HK91 .22 conversion.
But to answer your question…I think you can convert a pistol to a rifle, but then can’t convert it back…so with that thinking you probably can just weld a barrel extension on it to go past 16" legal length, then put a rifle stock on it, but it will always be titled a pistol. I have seen the barrel extensions somewhere but can’t recall right now.
Also, you can pay the NFA tax to SBR it and just slap a stock on it as is when the stamp comes back. Then maybe get the .22 kit, and maybe a registered sear!
I think the op is asking about buying a 91 pistol as a base for a hk 51 style sbr.
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Ummmm–no. If the receiver is registered as a pistol, regardless of barrel length, and you put a stock on it, have a fun time in Federal Pound-Me-In-The-Ass prison for violating the NFA…
I may be incorrect here but,
I’m not familiar with your HK,
But,
I believe if your firearm is registered as a Pistol when manufactured 7 sold,
it must remain a pistol & you are not allowed, legally to change it to a Rifle.
I may be incorrect & if am please disregard.
When it comes to 51s you CANNOT just slap a regular stock on it. The recoil assembly has been modified.
You are incorrect. But I’m pretty sure the reverse might be true.
Correct, I forgot about that. The recoil spring assembly will need to be shortened. Some use a 2-piece collapsing tube with a shortened spring, others a 2-piece U-shaped wire assembly with shortened spring. There are manufacturers that could fabricate one. Vector might or could put you in the right direction.
Here is a link for the barrel extension
http://mfiap.com/i-10275301-mfi-long-barrel-extension-for-hk53-vector-53-ptr91-pdw-pistols-922r-compliant-8-625-to-make-a-16-barrel.html
There’s a bunch of new confusing rulings about now being able to swap back and forth between pistol and rifle, as long as it is papered as a pistol originally. In any case, the old ruling was that a pistol can become a rifle, but it can’t be changed back to a pistol. A rifle can never become a pistol, if it was originally papered as a rifle.
Either a rifle or a pistol can become an SBR.
And yes, you need a collapsing recoil rod for an HK51-style SBR.
I love the looks of the 51, but a 9" .308 is a bit short. If you want a short one, the 12.7" G3k length is about as short as is practical. I’ve got a PTR at K length, and I love that thing. If you want short, get one of their 16" K variants that has the K length cocking tube and handguard. You can leave it 16", cut to 16" with a pinned hider, or get it cut to 12.7" and SBR.
There’s another thread on here about which PTR ser no ranges had the shallow flutes, if you are buying a used or NOS model.
Thanks, that was the info I needed. Not a fan of “confusing” rulings, mainly because I seem to have a kick-me sign that is highly visible to Law Enforcement–those guys have a big red light or something if I even let my car inspection sticker expire.
And the installation of a recoil rod would probably push the price up over a new rifle. So it loses its attractiveness.