Pistol Caliber Carbine Builds - Parts sales and What parts did you use and why?

[LiveLife]

I’ve been reading up on buffers and springs. I purchased a Spikes Tactical 8oz. buffer after reading a lot of suggestions that heavier buffers are better for these blowback rifles ... I figured with the 5.5 oz. bufffer and car spring that came with the rifle, the 8oz. bufffer, and XP spring, I’m bound to find a combo that works.

Went with the KAK 9mm buffer, 5.4oz, standard carbine spring.

Ended up with 21.3 oz between buffer and bolt

With a Spikes 8oz. buffer and car spring, it ran 100% with 115gr, 124gr, and 147gr (Freedom Munitions). Worked perfectly, recoil not bad.

PSA bolt weighs 14.9oz, so the total bolt + buffer weight = 22.9oz.

Great!

With carbine recoil spring, I found 19-22 oz combined weight of buffer and bolt produces more comfortable felt recoil. 16-18 oz combined weight produces harsher felt recoil.

PSA bolt 14.7 oz + PSA buffer 5.3 oz = 20 oz combined weight and produces comfortable felt recoil with various 9mm loads. Since 9mm carbines are blowback, for longest "in battery" time for more consistent chamber pressures (and not get case base bulged brass), use heaviest buffer that will reliably cycle the bolt.

With 20 oz combined weight, my 9mm carbines will cycle even lighter target loads (115 gr RMR FMJ with 4.6 gr W231/HP-38 or 4.1-4.2 gr Red Dot/Promo).

For reference:

- H1 buffer weighs 3.8 oz
- H2 buffer weighs 4.6 oz
- H3 buffer weighs 5.4 oz

 

[LiveLife]

Spike's Tactical is offering dedicated 9mm lowers for Colt and Glock magazines ($175) - https://www.spikestactical.com/products/stripped-lower-9mm-spider?variant=32734025292

LRBHO is offered on Glock lower ($157 + free shipping from JBO) - https://www.joeboboutfitters.com/Spike-s-Tactical-9mm-Glock-Style-Lower-Forged-Spid-p/sp-stls920.htm

The Spike's Tactical 9mm Glock Style Lower Forged Spider Stripped w/ LRBHO ...

This lower features a last round bolt hold open feature that locks the bolt back once the magazine is empty.

 

[Citadel99]

What about the Stern Defense Mag-AD9 AR-15 Glock mag adapter?

https://getstern.com/products/mag-ad9

it seems like a prime candidate for use in an SBR'd AR-15 lower.

That's exactly what I'm thinking. I have a SBR'd AR-15 lower and can get in the game with this and a really short upper without a new stamp...

Mark

 

[hapidogbreath]

Has anyone made a build that uses Sten mags??? Thinking of making one. Can't seem to find a MAG well adapter that will work. Anyone with info greatly appreciated.

 

[Chuck R.]

Has anybody taken a look at the MEAN adaptor:



https://www.meanarms.com/

Looks like it might be very cool for the guys with SBR AR15 lowers.....

 

[GunnyUSMC]

Has anybody taken a look at the MEAN adaptor:



https://www.meanarms.com/

Looks like it might be very cool for the guys with SBR AR15 lowers.....

That looks pretty cool. I checked their websites and the mag adapters are $24.99 or three for $68.99. They have free shipping right now with code FREESHIP. I went ahead and ordered one to see how it works.

 

[Gtscotty]

Has anybody taken a look at the MEAN adaptor:



https://www.meanarms.com/

Looks like it might be very cool for the guys with SBR AR15 lowers.....

That's super cool, thanks for posting. I might wind up going that path for my pistol lower, that way I can use the same lower as 5.56 If I want to try a 9mm AR, $68, a few P-Mags (that won't require permanent modification) and an upper/buffer and I'll be set.

 

[Hokie_PhD]

Gunny they look cool.
Unless I misunderstood this is a preorder, so don’t expect it anytime soon. That said, I’d love to see your results when it comes and you have time to 0lay with them.

 

[GunnyUSMC]

Gunny they look cool.
Unless I misunderstood this is a preorder, so don’t expect it anytime soon. That said, I’d love to see your results when it comes and you have time to 0lay with them.

I’m in no rush to get it. It will give me something to do with another lower.

 

[Hokie_PhD]

I’m in no rush to get it. It will give me something to do with another lower.

Yea yea like you need an excuse

I hope you don’t wait too long as that will be cool if they deliver and work well.

 

[hapidogbreath]

I like it. Going to order... Thanks for posting.