 |
Posted: 6/14/2008 4:21:31 PM
For what's it worth, I have bought 2 uppers from M&A Parts. 1 is 10 inch the other 11 1/2 inch, and both of them run all day long.
There is nothing special except that they got the gas hole the right size. No funny pig tails, no over sizing the gas hole, just darn good stuff form M&A. Now talk about 7 inchers,,,,,I have never seen one that will go fact and empty a 30 rd mag without hiccuping at least once. If anyone know a good builder of them 7inchers, please let me know.... good luck, and keep your powder dry :) |
|
|
|
|
Posted: 8/18/2008 4:41:43 PM
 |
|
|
|
Casper_SWAT
Shall not be Infringed
Team Member
Joined: Mar 2008  AR, USA
 Posts: 217 Feedback: 0% (0) Link To This Post |
Posted: 8/21/2010 12:21:23 AM
Originally Posted By 321Bang:
A police friend of mine just purchased a 10.5 A2 upper for his issue M16. The 20 in upper runs fine and the 10.5 fires fine and will eject like it should but it will not pick up another round from the magazine. It is as if it is either cycling so fast that the mag doesn't have time to push another round up, or the carrier isn't coming back far enough to pick up another round but, far enough to eject. He is wanting to clip a couple of coils off of the action spring. My solution is to open up the gas port going to the gas tube. What do you guys think? How exactly do you open up the port? Who is right? To clip or not to clip is the question. I don't think that clipping is the answer since it runs fine with the 20 in. Oh and by the way his lower is using the collapsible stock and we have tried several mags. Thanks...321 I had the same problem. The carrier isn't coming back far enough to pick up another round but, far enough to eject, open up the gas port going to the gas tube. How exactly do you open up the port? With a drill. |
|
|
Casper_SWAT
Shall not be Infringed
Team Member
Joined: Mar 2008 AR, USA
Posts: 218 Feedback: 0% (0) Link To This Post |
Posted: 8/21/2010 12:25:15 AM
Originally Posted By 321Bang:
Ok, my friend is requesting that I drill the gas port. He seems confident enough in my abilities but I am not as confident as he is. So my question now is. If I was to accidentally drill it too much, what effect will that have on functioning? Should one error on the not enough side as too much? Mistakes happen and God knows that I am entirely capable of performing many more. More info would be greatly appreciated.. Thanks again..321 choose a drill bit that is just slighty larger than the current gas port and go slow, then test. |
|
|
|
Posted: 8/28/2010 8:19:05 PM
AR10 buffer spring fixed all my 10.5" M16's issues.
 |
|
|
|
|
Posted: 9/15/2010 9:13:43 PM
[Last Edit: 9/20/2010 9:14:41 PM by BASE]
Okay, I've followed this one for a while and finally decided to try a 10.5 upper on my RR.
I took some of your advice and got a LMT 10.3" upper with a LMT BCG. I added a 1-piece gas ring to the BCG and a H2 buffer in the carbine length lower. This thing short strokes with all the ammo I have tried in it. M855 seems to work the best and will cycle the gun, but it won't lock open unless I'm running the suppressor. Most other ammo won't run at all without the suppressor, it'll kick the spent case out and close without picking up another. I had a wolf spring in it at first and it would short stroke with the M855. After changing the spring back to a normal one it seems to barely run with the M855. I thought it might loosen up after a while but 1000rnds later it seems to be worse if anything. I haven't heard of anyone ever having problems with the LMT uppers. Is it possible that this thing needs the gas port reamed out a bit? I did take the gas block off and chop it so I could mount a DD rail over the top it. I don't know what I could have screwed up there though. I've thought about trying a different buffer, but it seems to me like something must me wrong or it would be working fine with the H2 everyone else seems to use. I think I've checked all of the obvious stuff like the gas key, gas tube fit, etc. I'd appreciate any ideas you guys might have. ETA: Never mind. It seems to have loosened up a bit now. Another 500rnds and a good cleaning seems to have sorted it out. It still doesn't like the silver bear but I think it's probably about the best compromise I'm going to get between unsuppressed and suppressed use. I've also noticed that it's a lot more sensitive to buffers than I would have thought. H works fine without the suppressor, H2 is fast suppressed (but no bolt bounce) and H3 is probably ideal with the suppressor. I still haven't tried the H with the suppressor, but I'm not in any hurry as it's running really fast with the H2. Now for a new one: Has anyone else noticed copper buildup on the brake or suppressor with one of these shorties? I've got a PWS brake that fits the YHM can and it's coated with copper now. I have to scrape the copper off of the brake every so often or the can gets difficult to install/remove. |
|
|
