User Panel
User Panel
User Panel
|
Posted: 2/28/2015 7:31:25 PM EDT
[#1]
so most of the time the bolt is failing to lock back?
|
|
|
|
Posted: 2/28/2015 7:36:07 PM EDT
[#2]
I loaded a bunch of mags with one round. The first 10 or so were fine. After those first shots it became hit or miss, mostly miss. When it would not lock back, I would get a "click" when pulling the trigger (on an empty chamber).
I'm thinking of getting drill bits to measure the gas port. I would have to figure out the equivalent size... |
|
|
|
Posted: 2/28/2015 7:36:46 PM EDT
[#3]
have you tried a lighter buffer?
|
|
|
|
Posted: 2/28/2015 7:39:44 PM EDT
[#4]
No, I didn't have a carbine buffer with me since I figured H or H2 is what is used. I will do that next time. I'm also assuming that the pistol tube is the same length (internally) as a carbine buffer tube.
|
|
|
|
Posted: 2/28/2015 7:43:54 PM EDT
[#5]
I believe the pistol tube is shorter internally, this with the H buffer is probably what your problem is
|
|
|
|
Posted: 2/28/2015 7:47:56 PM EDT
[#6]
ah, makes sense. spring is more compressed so more resistance.
|
|
|
|
Posted: 2/28/2015 8:01:22 PM EDT
[#7]
I had a build do the same thing with a Spikes ST-T2 Buffer twice with XM855. It was way early in the guns round count. No issues since and never any issues with XM193 or various match ammo.
I'd give it some more range time then swap the buffer to a lighter one if you keep having issues. |
|
|
|
Posted: 3/1/2015 3:09:39 AM EDT
[#8]
What ammo? MK18 gas port spec is probably only big enough to run M193/M855 and running anything less powerful will require a bigger port.
|
|
|
|
Posted: 3/1/2015 3:19:42 PM EDT
[#9]
When you pull the bolt back manually, does it clear the catch much, or just barely? If you manually engage the bolt catch, does it have a good overlap with the bolt? I had one build with a buffer that didn't allow enough travel, had to shorten it a bit so that it could clear the catch. The catch also required modification to give it enough vertical travel to engage the bolt.
|
|
|
|
Posted: 3/1/2015 8:54:07 PM EDT
[#10]
Quote HistoryQuoted:
What ammo? MK18 gas port spec is probably only big enough to run M193/M855 and running anything less powerful will require a bigger port. wolf gold |
|
|
|
Posted: 3/2/2015 3:53:29 PM EDT
[#11]
The pistol tube should not be shorter. Slap in a carbine buffer.
|
|
|
|
Posted: 3/2/2015 5:42:07 PM EDT
[#12]
Quote HistoryQuoted:
The pistol tube should not be shorter. Slap in a carbine buffer. this or cut a coil or two off the buffer spring if you don't have a carbine buffer. |
|
|
|
Posted: 3/3/2015 12:02:28 AM EDT
[#13]
Quote HistoryQuoted:
this or cut a coil or two off the buffer spring if you don't have a carbine buffer. Quote HistoryQuoted:
Quoted:
The pistol tube should not be shorter. Slap in a carbine buffer. this or cut a coil or two off the buffer spring if you don't have a carbine buffer. It should work with an H and H2. If the pistol tube is not shorter than a carbine tube, does this mean it is undergassed? I am looking for #50 and #51 drill bits to measure the port. If it is under .07 I am sending it back to adco. |
|
|
|
Posted: 3/3/2015 7:44:50 PM EDT
[#14]
yes you are correct that it should work with those buffers. It definitely sounds like a gas problem, but could be one of a number of things concerning operation of the carrier. most likely gas though.
|
|
|
|
Posted: 3/4/2015 9:46:22 PM EDT
[#15]
Well, I'm at a loss. Just bought a #50 drill bit (0.07 ") and it fit through the gas port. I guess all that is left is that I measure the inside of my pistol buffer tube and confirm it is the same length as a carbine one and play with the spring and buffer. Unless anyone has other ideas...
|
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
