Get a LRBHO lower, or a Frontier upper with LRBHO.
I have both the Glock and Colt pattern AR9’s…………I love the Glock, it is a QC 10 lower…………I took the LRBHO parts off and have never looked back…………If you don’t run a magazine dry, stick another one in and keep shooting………This thing has been flawless since I sent the barrel to Macon armory for a feed cone rework and it gobbles up everything…………
Ran another quick 100 rounds of factory ammo just today for a big fat total of about 350. No issues since switching to factory ammo. I don’t mind the charging handle deal tbh. It’s not like it’s a completely foreign mode of use. If you get a bit weak with running the CH, you will experience hang ups on chambering so it’s a conscious effort to make sure you run it hard. Bottom line, it’s crap ton of fun to shoot, cheaper and you can shoot close in with your steel without cratering or crap flying back at you. It’s starting to cool off here so I’ll be shooting it more as I come out of hiberation from the covered benches at the club where I shoot :rolleyes:
Everything I have read is that LRBHO is problematic which I why I didn’t even bother messing with it. If I had continued with feed failures with factory ammo, I would have sent it to Macon. Seems like they do solid work.
Macon armory is first class………he is a guru when it comes to PCC……….told him what the build was doing and he said he could fix…he did…….runs like a champ…………I asked him a question on another build, over the phone and he told me to do two things…to correct the problem…which it did……….Macon is go-to for PCC needs……………simple as that
It’s bed time. I just took a look at this lower. It might be worth a try.
Looks like a rebadged New Frontier lower but in Glock.
Was out yesterday and now have the round count at 400 with no further issues. Chrono’d my new load against American Eagle 115gr and they are running a little quicker; 1250 vs 1200. My 147gr HST reloads came in at 960fps. Does anyone know what barrel length Federal test their loads with?
MAC has a video up on Stern Defense, which Brownells recently started carrying. Looks very interesting, I’m tempted to try the magwell adapter and complete upper if they’re both in stock at the same time as a 10% off coupon is announced.
OP… If you’re looking to do a AR9, the owner of the site I just listed was building them before they were AR9’s
His run around the 2-3K mark… but I believe he will just sell his BCG’s they are worth every penny. I have one of his custom jobs… Runs like a sewing machine. There is something about his bolts. I’ve used them in other builds. AMAZING!!!
For that kind of money I would have probably gone SP5K with brace. That said, decisions were made, gun was built, shots were fired [emoji4] Life is good.
I appreciate the input though.
So bringing this one back, I’m now looking at an aftermarket triggers. I have been using a Daniel Defense standard trigger which is been reliable but seems slow to reset. I’m running the Spinta flat side BCG. Anyone have any experience using this BCG and an aftermarket trigger that works well?
I have two complete pistol build with NFA … Got a AR 9 build and a AR 15 … Both in a pistol configuration… very please … My recommendation is a heavy buffer and heavy spring … 
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I have both heavy spring and buffer. What trigger are you using in the 9mm?
The only one’s I know for sure work are mil-spec and JP with the caveat that you are running JP internals, so that doesn’t really make it kosher either, but it’s an option. Geissele made mine a single shot. 
Edit: I’m running a ramped YHM carrier, YHM 9mm buffer and a Wilson Combat heavy spring.
I was reading over on Brian Enos that people had good luck with Hiperfire triggers. CMC makes one supposedly for 9mm but after some research seems very hit and miss.
I run 2 Colt 6991 10.5 inch carbine/pistol. One is full auto. I found that on the FA that a KAK 10 oz tungsten sliding weighted buffer and a regular carbine buffer works the best. On FA it slows the rate of fire down to about 850-900rps.
The simi auto l runs a Vltor H2A5 buffer just shy of 7 oz. I found that a 308 buffer spring gives to much speed as it slams another round home. I went to a regular carbine buffer spring after that. I’ve tried every combo and then some. These for me have worked out the best. It’s all subjective though.
Smokin338 seems like he has tried different combos as well. When it comes to 9mm AR’s there is no perfect combo. Both of us have tried obviously. I like what smokin338 has going except the 308 spring(not saying it’s bad). For me I like carbine buffer spring.