9mm AR Project - latest photo post #26- Updated!

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O'Kelly's Boys

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So here is my latest project: a 9mm AR:

-CMMG M4 Upper w/M4 feed ramps
-RRA 10.5 9mm barrel (Front sight tower to be removed shortly)
-RRA 9mm A1 Flash hider
-RRA 9mm case deflector & ejection port door
-Troy MRF-X 10” Rail
-LMT Charging handle
-Yankee Hill/CMMG 9mm Bolt Carrier group ramped for use w/M16 hammer
-Spike’s ST-15 Multi cal lower w/color safe/semi bullet markings
-RRA Lower parts kit
-RRA Ambi selector switch
-Spike’s 9mm mag block
-Spike’s ST-9X heavy buffer
-CP-LAR 9mm mags
-Ace ARFX stock

Not exactly the newest idea in ARs, but I've wanted a fun shortie for some time now and this is it. Now to fire up the assembly line:D

More to follow.

O'Kelly's Boys
 
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Deckard said:
Show how you remove the tower. They seem put on hard.
Click to expand...

Hopefully the RRA FSB is not tougher than any other.

I removed the front sight base on my other AR and replaced it with a low profile gas block. Not too tricky, just take your time so you don't scratch the crap out of your barrel.

1) You'll need to remove the flash hider first.

2) Drift the FSB pins with a hammer and punch - left to right typically, but check both sides to confirm which end is smaller/bigger (unless non tapered in which case it doesn't matter). Support the barrel well and don't muck around with it; give it a good sharp smack and they will move. Once started, use a smaller punch to push them out.

2) Oil up the FSB and barrel and wiggle the FSB off. Just take your time.

I think the instructions are also on AR15.com

Cheers,

O'Kelly's Boys
 
Supposed to be doing yard work today, but I just wanted to get it started...
So now that its 85% done its my head off by the wife if I don't get to work around the house.

Deckard,

The FSB came off no problem. No scratches, nice and clean. I'll repark the barrel in the fullness of time.

Pictures to follow shortly:D

Grunt 21,

Good to hear from you guy. You in country yet? Keep safe dude.

Cheers,

O'Kelly's Boys
 
Yeah, the RRA FSB come off as easily as you've already experienced. The pins are tapered and they do come out left to right. However, with other brands, I would not rely on the smaller/bigger pin ends interpretation to which side the pins come out. Looks can be deceiving.

Looks like you need some guts for that lower and you're done. Also, you're going to want a retractable stock of sorts. Not sure if you're going to be happy with that ARFX.

All in all, it's a very nice kit.
 
Deckard said:
What are you doing with the FSB? I'm gathering parts for the same project - not sure if I will go conventional or free float.
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If you're looking for a FSB shoot me a message, I've got two in the parts box.

Personally, I like the free float and the vert forward grip. I really want that AR/subgun look.

Cheers,

O'Kelly's Boys
 
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Mostly put together. The Troy rail is not tightned down; I want to install a vert grip on the lower half before I do.

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10.5 barrel and flash hider with a 10.0 rail.

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9mm AR guys: I have some questions:

1) The ST-9x heavy buffer is a dedicated 9mm buffer. It should only require a standard CAR buffer spring right? So why does it rattle around in the buffer tube? Is it due to the extra weight of the buffer?

2) The CMMG BCG is ramped to be used with a 5.56 hammer. When I open the upper, if I allow it, the BCG would slide out of the upper without being pulled out. Is this normal or am I missing something?

3) The upper is not a dedicated 9mm upper, it is a standard 5.56 upper with gas tube hole. Does the hole need to be plugged or is this a non issue?

Some observations:

The Spike's Tactical mag block is rock solid. There are 3 points of contact that are tightened with 2 x allen keys. The mag release works clean and the bolt hold open looks like it should work ok. The mags insert clean and drop free.

I like the feel and look of the Ace stock. Its perfect length and feels solid. The picture makes the gun look longer than it is. Its a short package with good weight and surprisingly good balance.

The ambi RRA selector switch is very positive. I'm a lefty. I have no problem with the 5.56 guns, I hope the 9mm is no differnt for blowing gas into my face.

I need the vert grip and rail ladder covers to finish the gun off...and some stinking longer mags!

I can hardly wait to get it to the range:D

Cheers,

O'Kelly's Boys
 
The stock 9mm buffer is too short it causes the bolt to bounce and slam against the mag catch. I broke my mag catch after about 2000 rounds.

I replaced it with 9mm buffer from Slash on ar15.com.

My ramped RRA bolt does the same - slides right out of the upper.

I find that I put the most rounds through my 9mm AR out of all my AR-15s.

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O'Kelly's Boys said:
9mm AR guys: I have some questions:

1) The ST-9x heavy buffer is a dedicated 9mm buffer. It should only require a standard CAR buffer spring right? So why does it rattle around in the buffer tube? Is it due to the extra weight of the buffer?

2) The CMMG BCG is ramped to be used with a 5.56 hammer. When I open the upper, if I allow it, the BCG would slide out of the upper without being pulled out. Is this normal or am I missing something?

3) The upper is not a dedicated 9mm upper, it is a standard 5.56 upper with gas tube hole. Does the hole need to be plugged or is this a non issue?
Click to expand...

1) I don't see why the buffer would make the spring rattle. I'd say the rattling has probably more to do with the buffer tube. Is it a bit longer than a conventional CAR buffer tube and the spring is slightly looser in the tube?

2) It shouldn't if your charging handle is in place. Shouldn't the fake gas key on the 9mm BCG prevent it from sliding out of your upper. Maybe I'm missing something myself and I'm wrong on this one.

3) Since a 9mm is a blowback, you don't need a gas tube installed and the gas tube hole at the front of the upper receiver is redundant and does not need to be plugged. You should not be concerned with gas getting blown in your face either.

Nice boomstick you ended up with.

I like yours too Paulinski. Very nice rig. :)
 
Paulinski said:
The stock 9mm buffer is too short it causes the bolt to bounce and slam against the mag catch. I broke my mag catch after about 2000 rounds.

I replaced it with 9mm buffer from Slash on ar15.com.

My ramped RRA bolt does the same - slides right out of the upper.

I find that I put the most rounds through my 9mm AR out of all my AR-15s.

DSCN2318.jpg
Click to expand...

The Spike's heavy buffer is longer than normal and is supposed to eliminate the problem of breaking bolt catches. Does your buffer rattle around more than that for the 5.56?

You wouldn't by any chance have an extra 5/30 steel mag for sale would ya?

O'Kelly's Boys
 
easy said:
1) I don't see why the buffer would make the spring rattle. I'd say the rattling has probably more to do with the buffer tube. Is it a bit longer than a conventional CAR buffer tube and the spring is slightly looser in the tube?

2) It shouldn't if your charging handle is in place. Shouldn't the fake gas key on the 9mm BCG prevent it from sliding out of your upper. Maybe I'm missing something myself and I'm wrong on this one.

3) Since a 9mm is a blowback, you don't need a gas tube installed and the gas tube hole at the front of the upper receiver is redundant and does not need to be plugged. You should not be concerned with gas getting blown in your face either.

Nice boomstick you ended up with.

I like yours too Paulinski. Very nice rig. :)
Click to expand...

Easy,

1) I don't think the tube is longer that a CAR tube or the Ace stock would not fit? It seems to be the same length of my 223 CAR tube without measuring mm's. The buffer spring is the one out of the 223 CAR tube so I can't help but think the extra weight of the buffer is the issue.

2) I'll play with the BCG & charging handle a little more and see what happens.

3) Thanks for the info.

O'Kelly's Boys
 
O'Kelly's Boys said:
Easy,

1) I don't think the tube is longer that a CAR tube or the Ace stock would not fit? ...
Click to expand...

Isn't the buffer tube included with the rest of the ACE stock? It looks longer in your photo in relation to the AR and collapsible stock shown in Paulinski's photo. I'm thinking if the tube is longer, the spring fits looser in it and that could allow it to rattle.

I know with certain rifle length stocks, the spring can be heard sproinging (if that's a word) right after firing and I heard that adding a bit of lube/grease to the spring tames it down. I wouldn't use grease, but ...

... and just to mention, I own a RRA BCG with a 9mm hammer installed in my gun and the carrier does NOT fall out with the charging handle in place. It also looks ramped on the bottom.
 
easy said:
Isn't the buffer tube included with the rest of the ACE stock? It looks longer in your photo in relation to the AR and collapsible stock shown in Paulinski's photo. I'm thinking if the tube is longer, the spring fits looser in it and that could allow it to rattle.

I know with certain rifle length stocks, the spring can be heard sproinging (if that's a word) right after firing and I heard that adding a bit of lube/grease to the spring tames it down. I wouldn't use grease, but ...
Click to expand...

I can't remember if the tube came with the stock or not. I'll have to go check my receipts in the morning, but I kinda remember buying a seperate tube.

This is not a sproing (its a word now) issue; I know that sound well. When you move the gun around it rattles very non-tactically.

I'll through the heavy buffer and spring into my other AR in the morning and see what it does.

O'Kelly's Boys
 
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