Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: First time shooting SBR, some help needed

  1. #1
    Join Date
    May 2013
    Posts
    75
    Feedback Score
    11 (100%)

    First time shooting SBR, some help needed

    Hit the range yesterday with the 10.5" SBR and AAC SDN6

    Lower is a factory Colt with Geissele Super Dynamic trigger
    Upper is a LMT 10.5" with a Daniel Defense BCG with a 51T Brake

    Rifle shot fine unsuppressed. Mounted the can and shot one round. Trigger pin pulled out of right side of rifle, dissabled gun. Pushed it back through and shot another round, FTE. Cycled bolt manually, double feed. And trigger pin started pulling out again.

    Clearly need some anti-rotation pins but whats up with the rifle FTE? Any tips would be appreciated.

    I'll be hitting the range again this week after I get the pins installed.

    Side Note: Got my first taste of shooting longer range (300 yards) with a Semi 308 and I think I'm hooked. Need to get my rear in gear and finish my MATEN build.

  2. #2
    Join Date
    Feb 2011
    Posts
    327
    Feedback Score
    31 (100%)
    I'm betting you do not have the legs of the hammer spring over the trigger pin. If you just pushed the pin back in without removing the hammer then you reinforced my last sentence. You do not need "anti rotation" pins to stop a pin from "falling out".

  3. #3
    Join Date
    May 2013
    Posts
    75
    Feedback Score
    11 (100%)
    Thanks for the tip, I'll look into this after work.

  4. #4
    Join Date
    Aug 2010
    Posts
    11,706
    Feedback Score
    43 (100%)
    Quote Originally Posted by dmaxfireman View Post
    I'm betting you do not have the legs of the hammer spring over the trigger pin. If you just pushed the pin back in without removing the hammer then you reinforced my last sentence. You do not need "anti rotation" pins to stop a pin from "falling out".
    Bingo. Incorrect assembly is to blame.

    As for the FTE 10.5" LMTs are way over gassed if I recall. You may want to look into a heavier buffer or an A5.

    Lastly, shoot the SBR at 300. No need for a 308 at such close distances.
    Why do the loudest do the least?

  5. #5
    Join Date
    May 2013
    Posts
    75
    Feedback Score
    11 (100%)
    I was going to get a 1-4 or 1-6x for my 14.5" and shoot that out to 300 first as I continue to work on my MATEN build.

    I'll be checking trigger assembly then messing wtih buffers and ammo to see what will run reliably.

  6. #6
    Join Date
    Feb 2011
    Posts
    327
    Feedback Score
    31 (100%)
    I'm running an a5h4 in my LMT 10.5. Softer than shooting a 22 unsuppressed and very reliable.

    Sent from my XT1254 using Tapatalk

  7. #7
    Join Date
    Nov 2014
    Posts
    145
    Feedback Score
    0
    Quote Originally Posted by Eurodriver View Post
    Bingo. Incorrect assembly is to blame.

    As for the FTE 10.5" LMTs are way over gassed if I recall. You may want to look into a heavier buffer or an A5.

    Lastly, shoot the SBR at 300. No need for a 308 at such close distances.
    You recall correctly. The LMT is way over gassed. Try an H3 and blue.

  8. #8
    Join Date
    Apr 2009
    Location
    Dallas, TX
    Posts
    2,347
    Feedback Score
    2 (100%)
    I run an H2 in my SBR lower with either my AAC 300blk upper or my 10.5" LMT. Runs like a top with and without the can in any configuration.

  9. #9
    Join Date
    Dec 2013
    Posts
    60
    Feedback Score
    0
    Quote Originally Posted by Eurodriver View Post
    Bingo. Incorrect assembly is to blame.

    As for the FTE 10.5" LMTs are way over gassed if I recall. You may want to look into a heavier buffer or an A5.

    Lastly, shoot the SBR at 300. No need for a 308 at such close distances.
    I shoot my 8.5" LWRC SBR at 300"yards and it is surprisingly consistent . Given I am using an Aimpoint PRO I am happy with the results . That being said using my HK MR762 with Nightforce scope is almost boring now due to the consistency. It's next to impossible to miss 12" steel with that combination . Now I am going after bowling pins foe something more challenging .


    Sent from my iPad using Tapatalk

  10. #10
    Join Date
    Jan 2008
    Location
    AZ-Waging jihad against crappy AR's.
    Posts
    24,902
    Feedback Score
    104 (100%)
    First off. The pin is most likely coming out due to incorrect assembly, as already mentioned.

    As for the rest. A double feed is caused by a bad magazine, it's not a weapon issue. You fail to mention what buffer you are using. If you are shooting suppressed you should be using an H3 buffer. There is no way to know if the LMT barrel is "overgassed" without measuring the port. LMT used to make their stuff with the smaller port, however it would appear that they have opened them up and are supposed to be around .078.

    The A5 is probably your best bet. If you are going to keep the current carbine receiver extension, get an H3 buffer and a blue Sprinco spring and you will be fine.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •