The dust cover is really optional, Mine ejects just fine without the modified dust cover and deflector.
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9mm AR Upper Questions
- Thread starter FOOMAN
- Start date
The dust cover is really optional, Mine ejects just fine without the modified dust cover and deflector.
Great input. Thanks. I will take all the advice you got to make this easier. I now have to find a barrel which should be fun.
Can I not use my standard 223 buffer, spring, and tube?
Can I not use my standard 223 buffer, spring, and tube?
I would use a dedicated 9mm buffer, they are quite heavier. you need as much mass as possible behind that bolt. the spring would be fine, but some people opt for xtra power springs.
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Adco is a good source.
Here's a great source for 9mm buffers if you want a super heavy one to eliminate as much port pop as possible. also 9mm buffers are longer
http://heavybuffers.com/ar15carbine.html
http://heavybuffers.com/ar15carbine.html
I checked out several heavier buffers for 9mm but I wanted it super quiet and I went with an 11oz buffer, sounds crazy having a buffer that heavy but there is no port pop as it delays the bolt opening and everything works great.
I love mine as well!
My colt came with a heavy buffer. Maybe that's why I don't have port pop. My bolt is rather heavy as well.
Found a guy on internet making 9mm barrels cut and threaded to size for $125 shipped. It may not be a problem but his info says "Heavy Profile" and barrel is not contoured. Does that matter? I haven't found another 5.5" barrel anywhere else.
Also, from what I understand as long as my BCG is ramped then I can use a standard 556 hammer (hope I said that right). Is that correct? Putting the pieces together now.
Also, from what I understand as long as my BCG is ramped then I can use a standard 556 hammer (hope I said that right). Is that correct? Putting the pieces together now.
I've built 3 9mm AR's and am a huge fan.
2 I built with dedicated CMMG lowers, one with an RRA magwell block.
I had a lot of issues around buffers, so I did a BUNCH of research.
I have a Spikes' buffer, a CMMG heavy(er) buffer, and a Heavy Buffers 8.5oz. Both the Spikes and the Heavy buffers are the more reliable choices IMHO.
Here is an excerpt of what I found:
2 I built with dedicated CMMG lowers, one with an RRA magwell block.
I had a lot of issues around buffers, so I did a BUNCH of research.
I have a Spikes' buffer, a CMMG heavy(er) buffer, and a Heavy Buffers 8.5oz. Both the Spikes and the Heavy buffers are the more reliable choices IMHO.
Here is an excerpt of what I found:
I've been doing a bit of research on 9mm buffers. While what came with the CMMG lower DOES work, I've had a couple of odd things happen like a casing getting caught between the charging handle and the bolt. Things that may benefit from slowing stuff down a bit.
So what's there? (somebody please correct me if I'm wrong here, I'm still learning a lot of this so some of it's my assumption):
In the pic below, there's a standard DoubleStar carbine buffer on the left. It weighs in at 2.9oz. On the right, there is the buffer from the CMMG lower, it weighs in at 5.4oz.
It's kind of hard to tell in the picture, but the 9mm buffer is uniformly thicker than the carbine buffer. Where the carbine has a shoulder to capture it up against the spring, the 9mm is the same/larger diameter all the way down.
The buffers are the same length.
What I have read/learned:
1) Spikes makes a spacer that supposedly keeps the bolt from contacting the rear. This can also be accomplished by putting about $1.25 in quarters in your buffer tube to shorten the throw, not an approach I favored.
2) Many folks are using Wolf XPS springs in conjunction with the heavier 9mm buffers to slow things down.
3) Of the buffers I can see, the choices are:
A) Spikes' at 4.05 oz Lower Parts - Spike's ST-9BS & ST-T2 Combo (9mm) [SLA0T2C] - $44.95 : Spikes Tactical
B) YHM at 4.5oz YHM 9mm Buffer Assembly
C) HeavyBuffers 9mm Q-Buffer at 8.5oz or 12oz. Heavy Buffers | Products
D) RRA at 5.6 oz
E) Tactical Intent seems to have a range up to 5.4oz: Amazon.com: Tactical Intent Carbine Buffer Asm for AR15 (various Weights): Sports & Outdoors
F) Hahn Precision at 7.0 oz Sub Caliber Buffer
