I've been wanting to build one for quite some time.  I have a Anderson stripped 5.56 lower to build off but the parts required are confusing.  Some take different hammers and no one mentions what mags they take.  Does anyone make a complete kit with fairly cheap and plentiful mags?

You will need a ramped bolt or 9mm hammer. I suggest a stock lower but change out the buffer for a heavy one.

You need a mag block. Most use Colt mags. The alternative is a dedicated 9mm lower like DDLES.

You will want the deflector at the back of the ejection port. It helps keep gas out of your face, as does the normal gasbuster mods.

That's about it.

Not sure I'd bother unless it was an SBR, but that's just me.

Get a dedicated lower. As soon as I can  get one I will be selling my mag block.

This...with a quieter on the end
 

I've got a Colt out of the box one. It runs good on C-products mags.

I had one, SBR with a can.





Lots of reading and gnashing of teeth to get the gun 95% reliable.  I sold the upper and bought a Noveske 300 BLK upper





ETA:  Wait for the new Sig 9mm rifle.  It looks pretty cool and is definitely russeling my jimmy.



 

.45 is better..

Get stainless steel trigger and hammer pins, too.

I'm running a home built 9mm AR. The important parts are a YHM 16" 9mm Barrel, CMMG Ramped Bolt, Spikes ST-T2 with 9mm Spacer, Spike Mag Block.

That is just damned sweet......DOE clone?

If you have the cash wait for the SIG rifle

I was going to build one but decided to wait for the MPX

Well 2 MPX going to run one as a pistol and SBR the other…

Edit: beat me while I was typing

Notched 5.56 hammer needs to be used with a ramped bolt.

No-notch 5.56 hammer can be used with either a ramped or unramped bolt.

No-notch 5.56 hammer + ramped bolt is the best, smoothest combo, IMO.


I cant remember if the bolt ramp, or lack thereof, matters with a 9mm hammer.  Ive never used one.

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I like that a lot!

I have a rra sbr 9mm and it runs like a top and is a tack driver out to 50 m

Plenty of info: http://www.ar15.com/forums/f_3/15_Rimfire_and_Pistol_Calibers.html

Here is what I have to offer on the subject.

To run the 9mm you need a mag block.  A piece of metal that slides into the magazine well and accepts 9mm magazines   if you look at the pictures of 9mm AR's you will see 3 pins in the magazine well - that is where the magwell has been drilled and the mag block pinned into place.

I was not a fan - so I bought a Hahn Mag block from Brownells.  there are two types of mag blocks, bottom loading ones (that have the potential to fall out of the mag well) and TOP LOADING  mag blocks, that fit into the mag well from above while you have the upper and lower opened up - it can't fall out and worked great for me.  If I wanted to go back to .223, I just took the upper off the rifle, pulled the mag block out, put on the 223 upper and that was it.

Yes, 633 clone built with an original upper.

ETA: Pictures....and to mention that a ramped bolt will eliminate any need for any special hammers.

Generally two different styles. "Olympic" and "Colt". I have both feeding types. I currently have a Colt Style 9mm carbine, Colt DOE Style 9mm pistol, and  9mm Oly pistol. I plan on getting rid of the Oly only to streamline magazines needs.

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Colt style bolt is on top, Oly style on the bottom.

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"Olympic" bolts have a coned end on the bolt and makes for a ramped barrel. Some feel this helps with feeding and reliability. I tend to agree.
Sten 32 rnd magazines are used. Magazines are still somewhat plentiful and reliable. I have two different types of magazine blocks. The first is a Hahn block. It is my favorite. The magazine release sets up right outside of the magazine well. The other (I don't know the maker) hangs a bit lower and has a longer magazine release. Both are squeeze release like the AK. Magazines set forward in the magazine well. There tends to be more wobble and play with the Sten mags/Oly style than with the Colt style. While it hasn't effected reliability....it is a bit annoying to me. Bolts do not lock open on the last round. The bolt catch does work for locking the bolt open.

"Colt" (and RRA) bolts are a flat faced bolt. Modified UZI mags and Colt mags are used. There are other "Colt style" after market 9mm magazines available. Beta C mag also makes a 9mm drum with a "Colt" tower. Pretty much 32rnd, 25rnd, 100rnd mags. There are several mag block makers out there. I have only used Hahn. They work so well....I haven't looked for any other. There are different Hahn blocks. I have only used and recommend the "dedicated" block. It feeds in from the top. It is recommended to haven an armourer install this....but if you don't know how to properly remove and re-install a bolt catch/release....I'd look for other hobbies than firearms. Like play dough and Pokémon cards. Bolt locks back after last round with magazines that have the right follower. UZI mag followers need to be reworked/messed with.

Hope this helps. I'm sure I've missed something and the net experts will be along to tear this to shreds.

Does the top loading Hahn block have to be pinned?

Nope.

Anyone know if this is a top or bottom load mag block?
http://www.midwayusa.com/product/163590/yankee-hill-machine-specter-upper-assembly-kit-ar-15-9mm-luger-16-barrel-1-in-14-twiste-matte-with-32-round-magazine

I've heard of butting quarters under the buffer spring.  What's up with that?

Not to be a Debbie Downer, but as a reloader, I don't see the advantage a 9mm AR has over a .223 or .300 Blackout AR.  Granted I am in Illinois and suppressors are verboten, and we just got SBR's, so my perception is a little clouded versus you guys in free-er states.

If you don't reload, yeah, I could see where a 9mm AR would be cheaper to shoot than a .223 and especially a .300 Blackout.

I agree, after extensively shooting one and being a reloader. There really isn't much cost difference to go with 556 loads, especially if you use pull down bullets and powder. Additionally you have to tinker with these for a while to get them to run. As many have mentioned, the sbr is really the optimal setup, but with the paperwork etc, I am dubious to it being really worth it. Honestly a glock 17 with a 33 round mag is a lot more fun.

I'm not interested in a sbr and I only reload wheel gun calibers.  I just want a 9mm carbine that takes hi cap mags.  I wanted a sub 2k until I handled one.  I've got a spare lower and want it 9mm.

I love posting this video

This one is mine. It was a title I rifle for a long time while waiting for the stamps, but is complete now:



Well I need to replace the plastic mag block. Waiting for Spikes blocks to be available again.

Thought about it, decided im going to get a single shot in 357 or 44 instead so i can run a good suppressed pistol round

CMMG Dedicated lower with CMMG (colt style) upper.... Hk style 3 Lug Muzzle Attachment.
I like it.

I have one in 16"..........I like it, it is fun to shoot.

I really have enjoyed mine-

That's my favorite configuration.............looks like a cool PDW

We hacked this out in the suppressor forum about 2 weeks ago.

9mm - quietest of the bunch. cheap ammo, great subsonic expansion but weak energy.
223 - loudest of the bunch.  most common ammo, lots of flash/erosion
330blk - mid level sound signature. most expensive ammo of the 3, best ballistics out of a SBR.


As far as short and quiet go, 9mm or 300blk are the better options.

I don't think that combination even works.  It doesn't on mine, anyway.  I have a ramped bolt and I have to use a hammer without the notch, else the hammer just follows the bolt home when it cycles.  

Double tap on the above post...

But on edit, I'll add that the way to roll with a 9mm AR is SBR, suppressed, and subsonic loads.  That's really the only reason I built mine.

I'd like to do one at some point but I have a F/A 9mm SMG (not to mention several pistol cal carbines that need to be SBR'd and tinkered with) so it isnt too high on my priorities list.

If running cheap mags is the goal then you can go Hahn magwell adapter and run Sten mags on an Oly patten upper.  I have a friend that has that setup and it runs well.