Paul-the new guy Posted February 22, 2019 Share Posted February 22, 2019 I have a matched receiver set that I did a form 1 on and turned into a .300BO SBR. It has a drop in trigger. I have put 6-700 rounds through it and it has run fine. I put together another upper using a VLTOR upper and with that upper I get light strikes. I thought it was the trigger, I pulled it out and it had some debris in it but upon reassembly it is still acting up. Could the mismatch receiver set be the issue? Link to comment Share on other sites More sharing options...
MJinPA Posted February 24, 2019 Share Posted February 24, 2019 Unlikely. Swap the BCG with the other and see if that worksSent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
mpeltier Posted February 24, 2019 Share Posted February 24, 2019 Is the Vltor upper 300 BO? What trigger? What buffer weight? Have you verified headspace? Link to comment Share on other sites More sharing options...
Paul-the new guy Posted February 25, 2019 Author Share Posted February 25, 2019 On 2/24/2019 at 8:00 AM, mpeltier said: Is the Vltor upper 300 BO? What trigger? What buffer weight? Have you verified headspace? The .300 BO upper is Devil Dog and it came as a set with the lower. It has always run 100% but round count is 5-600 at most. 99% suppressed. Trigger is and older ELF Tactical and it has been in this lower since day 1. The Vltor upper is .223 it has had 2 barrels, the first one was a Faxon and it had the issue the new barrel that I just installed has a properly headspaced bolt. I just changed out the ELF trigger for an AR Gold that I pulled out of another rifle. I have only fired about 20 rounds but so far no issues. Seems weird that it could be the trigger Link to comment Share on other sites More sharing options...
MJinPA Posted February 25, 2019 Share Posted February 25, 2019 The .300 BO upper is Devil Dog and it came as a set with the lower. It has always run 100% but round count is 5-600 at most. 99% suppressed. Trigger is and older ELF Tactical and it has been in this lower since day 1. The Vltor upper is .223 it has had 2 barrels, the first one was a Faxon and it had the issue the new barrel that I just installed has a properly headspaced bolt. I just changed out the ELF trigger for an AR Gold that I pulled out of another rifle. I have only fired about 20 rounds but so far no issues. Seems weird that it could be the triggerNot sure about the elf tactical but their 3gun and match triggers have set screws that need to be cranked down pretty tight then locked in with the lock screws. From their FAQ....”Q: After installing my Elf Trigger I’m getting intermittent primer strikes that look like the firing pin is barely tapping the primer and will not ignite the round.A: 99% of the time this issue is caused by incorrect installation. Whether anti-walk pins are used or not, the set screws on the inside of the trigger body must be firmly seated against your receiver floor. It is absolutely critical that these screws are seated firmly. Turn one side until it’s barely snug then tighten the other side and alternate so pressure is evenly distributed. We now include a steel floor plate to protect your receiver – optional in aluminum receivers but required for polymer.Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Paul-the new guy Posted February 25, 2019 Author Share Posted February 25, 2019 5 minutes ago, MJinPA said: Not sure about the elf tactical but their 3gun and match triggers have set screws that need to be cranked down pretty tight then locked in with the lock screws. From their FAQ....”Q: After installing my Elf Trigger I’m getting intermittent primer strikes that look like the firing pin is barely tapping the primer and will not ignite the round. A: 99% of the time this issue is caused by incorrect installation. Whether anti-walk pins are used or not, the set screws on the inside of the trigger body must be firmly seated against your receiver floor. It is absolutely critical that these screws are seated firmly. Turn one side until it’s barely snug then tighten the other side and alternate so pressure is evenly distributed. We now include a steel floor plate to protect your receiver – optional in aluminum receivers but required for polymer. Sent from my iPhone using Tapatalk I went trough all of that. I used regular pins, I torqued the set screws like crazy with a T-Handle wrench. All of the rounds were suppressed so both times I took it out it was FILTHY. The first time it had some debris in it and I really thought that was the issue. ::shrug:: Link to comment Share on other sites More sharing options...
mpeltier Posted February 26, 2019 Share Posted February 26, 2019 What buffer? Standard carbine? Link to comment Share on other sites More sharing options...
Paul-the new guy Posted February 26, 2019 Author Share Posted February 26, 2019 6 hours ago, mpeltier said: What buffer? Standard carbine? Carbine length H2 buffer. I swapped the trigger out for one out of another lower. It is a different brand trigger also. I put 60 rounds through it so far with zero issues but it isn't very dirty yet. Link to comment Share on other sites More sharing options...
mpeltier Posted February 27, 2019 Share Posted February 27, 2019 Sounds like you're on the right track with the trigger. The next heaviest buffer may help with the dirty ness also when using the suppressor. Link to comment Share on other sites More sharing options...
AverageJoeShooting Posted March 3, 2019 Share Posted March 3, 2019 Im having the same issue with a rifle i just built. out of curiosity did you check the the disconnect spring? Link to comment Share on other sites More sharing options...
Paul-the new guy Posted March 4, 2019 Author Share Posted March 4, 2019 On 3/2/2019 at 7:00 PM, AverageJoeShooting said: Im having the same issue with a rifle i just built. out of curiosity did you check the the disconnect spring? I use drop in triggers. I didn't check any springs. Link to comment Share on other sites More sharing options...
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