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Posted: 7/21/2013 6:19:26 AM EST
Just finished first build and took out to range. Bolt doesn't lock back after last round fired. I tried several new unopened pmags and all did the same. So assume its not the mags. Troubleshooting help...
Link Posted: 7/21/2013 6:24:15 AM EST
[#1]
what ammo are you shooting and whats your rifle setup? gas system, buffer weight, all that good stuff.
Link Posted: 7/21/2013 6:29:23 AM EST
[#2]
ammo or buffer/spring. tulammo is known weak.
Link Posted: 7/21/2013 6:32:47 AM EST
[#3]



Discussion ForumsJump to Quoted PostQuote History
Quoted:




what ammo are you shooting and whats your rifle setup? gas system, buffer weight, all that good stuff.
View Quote
A) Since you built the rifle; do you know how/did you properly lube the rifle for your range trip?


B) Who made your barrel?










95% chance that the rifle is under-lubed, or you're shooting weak ammo with an H or H2 buffer and the ammo doesn't have enough attitude to fully cycle the BCG. Do/did you have any failures besides not locking back on empty? (any short-strokes/failures to feed?)







Tula and Herter's (re-boxed Tula) are weak ammo and don't fully cycle rifles sometimes. If that's what you were shooting, you probably need more lube. It's common for rifles to need run somewhat wet with lube for a few hundred rounds until things wear in sufficiently and everyone gets happy.


 
Link Posted: 7/21/2013 6:38:12 AM EST
[#4]
With an empty mag in, does it lock back if you pull the bolt back with the charging handle?
Link Posted: 7/21/2013 7:32:37 AM EST
[#5]
Did you check for gas leaking at the front sight block?
Your buffer may be too heavy.

What ammo you using?
Link Posted: 7/21/2013 7:40:39 AM EST
[#6]
Did you assemble the lower/upper yourself or was it bought already assembled? You may have used the wrong spring for your bolt catch causing it to bind up. I've seen people use the disconnecter spring by accident which will cause what your describing.
Link Posted: 7/21/2013 7:40:50 AM EST
[#7]
Quoted:
Just finished first build and took out to range. Bolt doesn't lock back after last round fired. I tried several new unopened pmags and all did the same. So assume its not the mags. Troubleshooting help...
View Quote



Clean and lubricate weapon.

1. Insert empty magazine, pull charging handle to rear..... does bolt stay locked back.

2. Load one round Mil Spec ammo, fire round...... does bolt lock back?

3. Put in carbine weight buffer, repeat (2)


Answers?
Link Posted: 7/21/2013 8:01:20 AM EST
[#8]
Quoted:
Just finished first build and took out to range. Bolt doesn't lock back after last round fired. I tried several new unopened pmags and all did the same. So assume its not the mags. Troubleshooting help...
View Quote


You don't by chance have a B.A.D. Lever  or similar type device attached to your bolt release?
Link Posted: 7/21/2013 8:16:11 AM EST
[#9]
The build is an Armalite upper with...
-JP Enterprises full mass BCG
-Rainier Arms UltraMatch 14.5" middy
-JP Enterprises silent captured spring
-Surefire muzzle brake
-Larue low profile gas block
-Larue Stealth 13.2" handguard
-Geissele SSF trigger
- Tactical Link BAD

This was the first time to the range and have never put a round through it. I applied FireClean to the internal components and ran it wet. The ammo not sure I grab 20rds out of a few K I had loose. This builds purpose is a duty car and want it to take anything I feed it. I did notice the hammer rubs against the bolt catch and binds the bolt catch up when disassembled from the upper. You have to push the hammer towards the cocking position just a tad to free the bolt catch but didn't think this would contribute to the issue considering the hammer is in the locked position during battery.

Also the BCG does lock back on an empty mag when charging. Tried firing one round 4 times and had the same outcome with no lock back.
Link Posted: 7/21/2013 8:20:55 AM EST
[#10]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
The build is an Armalite upper with...
-JP Enterprises full mass BCG
-Rainier Arms UltraMatch 14.5" middy
-JP Enterprises silent captured spring
-Surefire muzzle brake
-Larue low profile gas block
-Larue Stealth 13.2" handguard
-Geissele SSF trigger
- Tactical Link BAD

This was the first time to the range and have never put a round through it. I applied FireClean to the internal components and ran it wet. The ammo not sure I grab 20rds out of a few K I had loose. This builds purpose is a duty car and want it to take anything I feed it. I did notice the hammer rubs against the bolt catch and binds the bolt catch up when disassembled from the upper. You have to push the hammer towards the cocking position just a tad to free the bolt catch but didn't think this would contribute to the issue considering the hammer is in the locked position during battery.
View Quote




Just try the simple setup on the bottom of the image, a standard buffer spring and a carbine weight buffer.

Link Posted: 7/21/2013 8:21:51 AM EST
[#11]
Discussion ForumsJump to Quoted PostQuote History
Quoted:




Just try the simple setup on the bottom of the image, a standard buffer spring and a carbine weight buffer.

http://img.photobucket.com/albums/v445/bravocompanyusa/VLTOR%20A5%20stock/a5buffer5.jpg
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
The build is an Armalite upper with...
-JP Enterprises full mass BCG
-Rainier Arms UltraMatch 14.5" middy
-JP Enterprises silent captured spring
-Surefire muzzle brake
-Larue low profile gas block
-Larue Stealth 13.2" handguard
-Geissele SSF trigger
- Tactical Link BAD

This was the first time to the range and have never put a round through it. I applied FireClean to the internal components and ran it wet. The ammo not sure I grab 20rds out of a few K I had loose. This builds purpose is a duty car and want it to take anything I feed it. I did notice the hammer rubs against the bolt catch and binds the bolt catch up when disassembled from the upper. You have to push the hammer towards the cocking position just a tad to free the bolt catch but didn't think this would contribute to the issue considering the hammer is in the locked position during battery.




Just try the simple setup on the bottom of the image, a standard buffer spring and a carbine weight buffer.

http://img.photobucket.com/albums/v445/bravocompanyusa/VLTOR%20A5%20stock/a5buffer5.jpg



Sorry, double post.
Link Posted: 7/21/2013 8:46:39 AM EST
[#12]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
The build is an Armalite upper with...
-JP Enterprises full mass BCG
-Rainier Arms UltraMatch 14.5" middy
-JP Enterprises silent captured spring
-Surefire muzzle brake
-Larue low profile gas block
-Larue Stealth 13.2" handguard
-Geissele SSF trigger
- Tactical Link BAD

This was the first time to the range and have never put a round through it. I applied FireClean to the internal components and ran it wet. The ammo not sure I grab 20rds out of a few K I had loose. This builds purpose is a duty car and want it to take anything I feed it. I did notice the hammer rubs against the bolt catch and binds the bolt catch up when disassembled from the upper. You have to push the hammer towards the cocking position just a tad to free the bolt catch but didn't think this would contribute to the issue considering the hammer is in the locked position during battery.

Also the BCG does lock back on an empty mag when charging. Tried firing one round 4 times and had the same outcome with no lock back.
View Quote


This is more than likely your problem. Others have had the same issue, remove it and try again.
Link Posted: 7/21/2013 10:44:17 AM EST
[#13]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
The build is an Armalite upper with...
-JP Enterprises full mass BCG
-Rainier Arms UltraMatch 14.5" middy
-JP Enterprises silent captured spring
-Surefire muzzle brake
-Larue low profile gas block
-Larue Stealth 13.2" handguard
-Geissele SSF trigger
- Tactical Link BAD

This was the first time to the range and have never put a round through it. I applied FireClean to the internal components and ran it wet. The ammo not sure I grab 20rds out of a few K I had loose. This builds purpose is a duty car and want it to take anything I feed it. I did notice the hammer rubs against the bolt catch and binds the bolt catch up when disassembled from the upper. You have to push the hammer towards the cocking position just a tad to free the bolt catch but didn't think this would contribute to the issue considering the hammer is in the locked position during battery.

Also the BCG does lock back on an empty mag when charging. Tried firing one round 4 times and had the same outcome with no lock back.
View Quote



Remove the Tactical Link BAD and try again.
Link Posted: 7/26/2013 2:44:45 PM EST
[#14]
If the bolt catch detent spring is over pressure, it won't allow the catch to operate quick enough to catch bolt when firing. It will manually operated. I ran across this a while back with some lower kits I bought from some one I normally did not buy from. Not something you normally run into, so it can chase you around. Hope this helps.
Craig.
Link Posted: 7/26/2013 2:47:33 PM EST
[#15]
Link Posted: 7/26/2013 3:53:02 PM EST
[#16]
Discussion ForumsJump to Quoted PostQuote History
Quoted:



What does that mean?
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View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
This builds purpose is a duty car



What does that mean?


im assuming he means it's purpose is a "duty carbine"?
Link Posted: 7/28/2013 10:37:53 AM EST
[#17]
Check your bolt catch, spring and plunger.
Link Posted: 7/28/2013 11:02:30 AM EST
[#18]
Link Posted: 7/28/2013 11:26:16 AM EST
[#19]
Are you using Magpul 10 rounders?
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