AR magazine well adapter for 9mm in 5.56 lower

Wambli Ska

I have a dedicated 9mm AR, BUT I also have a registered SBR and it would be cool every once in a while to converted it into a range toy by putting my Shorty 9m upper on it.  Of course it's a 5.56/.223 lower and I've seen some adapters that sit inside the mag well and accept Glock or old style 9mm AR mags and that has made me curious.  My only experience with them was an old Stag Arms 9mm pistol I bough many moons ago and it used old style mags and reliability was atrocious so I ended up selling it because it was so frustrating to deal with.  Have they gotten any better?  Does anyone here have any experience with those?

ilove22s

fwiw,

i got mine when you had your issues.

but i would just see whats still - left/survived - and go from there.  My LGS/Gunsmith told me to make sure the mag was secure in the MW and that was the key to the problems.  I just went by his experience and so far, no issue.

i know at one time there was the "oly" system and the "colt" system, if you know what the differences are that may help still.

and you may want to look at what uses what mags and whats has cheaper and available mags.

Do you know what system is your upper?  Since that will play a difference on the MWA you can use.

fwiw, i got an OLY system and they have worked fine.   The MWA i got for my 9 was made near OLY and they are no longer in business, but they use set screws to lock into place and there is a piece in front/back of the mag.  It uses STEN mags and the OEM mag release, but you need to machine a notch into the mags.  

good luck

CHIRO1989

Will this fit your upper?
https://palmettostatearmory.com/blem-psa-px9mm-forged-complete-moe-ept-shockwave-lower-black-uses-glockr-style-magazine.html

Wambli Ska

CHIRO1989 said:

Will this fit your upper?
https://palmettostatearmory.com/blem-psa-px9mm-forged-complete-moe-ept-shockwave-lower-black-uses-glockr-style-magazine.html

Yep, Actually that’s the lower I have on my dedicated 9mm AR pistol.  It runs 100%!!!  But it’s not an SBR.  My registered SBR is a .223/5.56 lower and I’m looking to make it more versatile.

CHIRO1989

Wambli Ska said:

CHIRO1989 said:

Will this fit your upper?
https://palmettostatearmory.com/blem-psa-px9mm-forged-complete-moe-ept-shockwave-lower-black-uses-glockr-style-magazine.html

Yep, Actually that’s the lower I have on my dedicated 9mm AR pistol.  It runs 100%!!!  But it’s not an SBR.  My registered SBR is a .223/5.56 lower and I’m looking to make it more versatile.

What is the difference for you if you use the pistol lower or the rifle lower? You want the longer length of pull with the SBR?

Wambli Ska

CHIRO1989 said:

Wambli Ska said:

CHIRO1989 said:

Will this fit your upper?
https://palmettostatearmory.com/blem-psa-px9mm-forged-complete-moe-ept-shockwave-lower-black-uses-glockr-style-magazine.html

Yep, Actually that’s the lower I have on my dedicated 9mm AR pistol.  It runs 100%!!!  But it’s not an SBR.  My registered SBR is a .223/5.56 lower and I’m looking to make it more versatile.

What is the difference for you if you use the pistol lower or the rifle lower? You want the longer length of pull with the SBR?

Not really, it’s just a 7” stock and I’ve never needed more from an AR.  I like them tucked tight (thank you Zee😁) and there is no recoil to stop me from doing this.  The SBR is just a cool fixed stock AR SBR and I think I’d be a great range toy at times, and I can set it up as a kit with 5.56 AND 9mm options.

CHIRO1989

OK, I thought there some tactical advantage I was not privy to , you just like the options

Wambli Ska

CHIRO1989 said:

OK, I thought there some tactical advantage I was not privy to , you just like the options

I know, it only makes sense in the small section of my brain where the idea was hatched.  I have everything I need more than covered so I’m now just making up crap to look into… 🤪

bullsi1911

I have heard that the Sylvan Arms mag well block is good, but I have no personal experience with it:

https://sylvanarms.com/product/gcb100/

Wambli Ska

bullsi1911 said:

I have heard that the Sylvan Arms mag well block is good, but I have no personal experience with it:

https://sylvanarms.com/product/gcb100/

Oh I like that one.  Seems like it’s built well!  Thanks!