Page 2 of 2 FirstFirst 12
Results 21 to 38 of 38

Thread: buffer weight issue

  1. #21
    Super Moderator LRRPF52's Avatar
    Join Date
    Sep 2014
    Location
    Utah
    Posts
    5,045
    For 18" RLGS, I wouldn't use anything more than a carbine 2.9oz buffer, if the port is .094" or smaller, shooting 120gr.
    NRA Basic, Pistol, Rifle, Shotgun, RSO

    CCW, CQM, DM, Long Range Rifle Instructor

    6.5 Grendel Reloading Handbooks can be found here:

    www.AR15buildbox.com

  2. #22
    After the first grendel build I did with the Faxon barrel mid length gas and with the little time invested in getting it running correctly.
    I think I am going to cut my losses and order another Faxon barrel.
    Either it works or it does not, and this combination does not work.
    Everything I enjoy doing is either illegal, immoral or, just to damn expensive

  3. #23
    Quote Originally Posted by LRRPF52 View Post
    For 18" RLGS, I wouldn't use anything more than a carbine 2.9oz buffer, if the port is .094" or smaller, shooting 120gr.
    The issues are the same as running the 2.9 oz buffer
    Again, I am not sure of the port on the barrel as I did not measure it.
    I would hope I would not have to though.
    All AP and BA parts, should work, right
    Last edited by blackholegun; 02-14-2018 at 02:59 AM.
    Everything I enjoy doing is either illegal, immoral or, just to damn expensive

  4. #24
    Warrior
    Join Date
    Dec 2017
    Location
    Philadelphia
    Posts
    103
    Is the bolt locking all the way back on the bolt catch on single shot, or does it let go when you drop a mag? If it lets go, it's not enough gas.
    Running a rifle length gas system on an 18" barrel means both gas pressure and dwell are diminished. I'd try a very wide open non-adjustable block on that rifle. And standard carbine buffer or, at max, a +1. Maybe even a lightened buffer spring.

    Added:
    Just a Q to clear up one possibility:
    How much free space do you have between the bolt lugs and the bolt catch when you pull your charging handle all the way back?
    Last edited by Tex Nomex; 02-14-2018 at 03:45 AM. Reason: sp / Question

  5. #25
    There is about 1/4-3/8" free space from all the way pulled back to locking on the bolt catch when releasing forward.
    With the adjustable gas block wide open, it would also not feed reliably.
    Everything I enjoy doing is either illegal, immoral or, just to damn expensive

  6. #26
    Warrior
    Join Date
    Dec 2017
    Location
    Philadelphia
    Posts
    103
    Quote Originally Posted by blackholegun View Post
    There is about 1/4-3/8" free space from all the way pulled back to locking on the bolt catch when releasing forward.
    With the adjustable gas block wide open, it would also not feed reliably.
    So we know it's not a tube issue, at least.

    With a marginal gas system:
    Any kind or resistance is bad - rough chamber, dry BCG, new/dry rings, mag spring too stiff (new mags)...
    Any kind of gas leak is bad - rough chamber, worn gas rings, loose gas block, misaligned gas block, worn gas tube, bad key seal...

    You might have a weak extractor not keeping its grip on the case head when pressured by the compressed mag spring, especially with new mags.

    I'd brush the chamber, check my gas key and tube end and shoot it with a non-adjustable gas block with a HUGE hole and some not-new magazines next. Sometimes these issues work themselves out after some shooting.
    Last edited by Tex Nomex; 02-14-2018 at 03:21 PM.

  7. #27
    Warrior
    Join Date
    Jul 2017
    Location
    Steeler Country
    Posts
    129
    Maybe this is implied in your post, but have you tried running it with the gas block opened more? If not, I'd try opening it all the way to help eliminate undergassing as the culprit (or at least mostly eliminate, as I'm currently dealing with undergassing on a fully open block but that's on a 12" barrel). And if your still restricting gas flow through the gas block, you don't need to worry about your gas port diameter just yet.

  8. #28
    I am going to chalk this one up as a "Lesson learned" thing.
    It is only my third build, so I am by no means fully experienced with the AR platform.
    I was kind of leary about the rifle length gas barrel and the carbine buffer system.
    I am now to the point of how can I fix this correctly and have a reliable gun.
    At this point, I think the only logical answer is to purchase a Faxon 18" barrel with mid length gas system as I have a 223 Wylde upper to run on the lower also.
    Will just have to sell the BA barrel to adjust some costs I guess
    Everything I enjoy doing is either illegal, immoral or, just to damn expensive

  9. #29
    Warrior
    Join Date
    Dec 2017
    Location
    Philadelphia
    Posts
    103
    Remember this for future builds: It's got nothing to do with the carbine buffer tube or carbine buffer. It is the long rifle gas system in a shorter-than-rifle barrel. It seems to need a larger gas port.

    Try a different non-adjustable gas block.
    -or-
    Drill out the gas port. Easy with a drill press or for a shop to do.
    -or-
    Run a suppressor.
    -or-
    Try a Krink-style muzzle device.

    You give up too easily. I truly believe this rig would be buttery smooth and accurate with a little more gas. Have you contacted BA and asked them how to make their barrel work? Could be out of spec.

  10. #30
    Quote Originally Posted by Tex Nomex View Post
    Remember this for future builds: It's got nothing to do with the carbine buffer tube or carbine buffer. It is the long rifle gas system in a shorter-than-rifle barrel. It seems to need a larger gas port.

    Try a different non-adjustable gas block.
    -or-
    Drill out the gas port. Easy with a drill press or for a shop to do.
    -or-
    Run a suppressor.
    -or-
    Try a Krink-style muzzle device.

    You give up too easily. I truly believe this rig would be buttery smooth and accurate with a little more gas. Have you contacted BA and asked them how to make their barrel work? Could be out of spec.
    I appreciate your suggestions, but in the end, they are not as cost effective or guaranteed to work.
    The Faxon barrel build I did worked as good as I could expect as far as function and reliability.
    I am not bashing BA as my Creedmoor is shooting fine with one of their barrels.
    Everything I enjoy doing is either illegal, immoral or, just to damn expensive

  11. #31
    Warrior grayfox's Avatar
    Join Date
    Jan 2017
    Location
    Northern VA
    Posts
    511
    Now that I think about it, I had an 18" rlg once upon a time... 264/6.5 "whatevah" - barrel was decent but it just didn't suit me.
    Wound up selling it and going with a couple of faxon's.
    Much more at peace now.
    Everyone has 1 or 2 "lessons learned" in their closet, not to worry.
    Chuck Norris doesn't do push-ups, the earth does push-aways.

  12. #32
    Warrior
    Join Date
    Dec 2017
    Location
    Philadelphia
    Posts
    103
    Quote Originally Posted by blackholegun View Post
    I appreciate your suggestions, but in the end, they are not as cost effective or guaranteed to work.
    The Faxon barrel build I did worked as good as I could expect as far as function and reliability.
    I am not bashing BA as my Creedmoor is shooting fine with one of their barrels.
    I completely understand. Had a car do me like that once...
    I purchased one of the group-buy 18" Faxons and it's a beauty for the money.
    Have yet to get to the range, though, so I can't offer you a range report.

  13. #33
    Super Moderator LRRPF52's Avatar
    Join Date
    Sep 2014
    Location
    Utah
    Posts
    5,045
    Open the port.
    NRA Basic, Pistol, Rifle, Shotgun, RSO

    CCW, CQM, DM, Long Range Rifle Instructor

    6.5 Grendel Reloading Handbooks can be found here:

    www.AR15buildbox.com

  14. #34
    Warrior Kswhitetails's Avatar
    Join Date
    Oct 2016
    Location
    South Central KS
    Posts
    495
    Quote Originally Posted by LRRPF52 View Post
    Open the port.
    This. Why spend money for another barrel, ($150+) - when you could strip things down, find a local machine shop, and pay much less to have a competent drill press user to step up the port a little? You've already got an adjustable gas block.

    I don't want to push you, but it seems to me that you're giving up right before the finish line. If you're dead set on going with another barrel anyway, and a shop is too inconvenient, why not try to do it yourself before you do? Could pay off, might not, but even if it doesn't you're not any worse off than your current plan?

    My advice - here, it comes with a free grain of salt.
    Nothing kills the incentive of men faster than a healthy sense of entitlement. Nothing kills entitlement faster than a healthy sense of achievement. Liberty leads to the ability to achieve. Nothing kills liberty faster than politicians that believe they are entitled to your achievements.

  15. #35
    Warrior
    Join Date
    Jul 2017
    Location
    Steeler Country
    Posts
    129
    I didn't want to chime in because I also don't want to push you, but I have to say I agree with LRRPF and Ksw. After the effort and $ you've already put into this, why not spend a half hour opening the gas port. Even if you don't have a drill press you could easily do it with a hand drill. Just determine the maximum drill depth you can go without marring the bore opposite the gas port and put a stop on the drill bit or some electrical tape to tell you when to stop.

    To each his own brother -- I'd just hate to see you abandon the barrel prematurely when an easy fix is in reach.

  16. #36
    I appreciate both of your guys advise, that is what is great about this sight.
    You will have to forgive me, but I already ordered the Faxon barrel for the sake of knowing in the end, I will have a reliable gun.
    Like I said, this only my third build, still learning.
    Someone will benefit from this as I am going to be selling the BA barrel.
    I do thank you guys and appreciate your input though.
    Everything I enjoy doing is either illegal, immoral or, just to damn expensive

  17. #37
    Warrior
    Join Date
    Jul 2017
    Location
    Steeler Country
    Posts
    129
    I have an 18" grendel mid length gas system and it's awesome. I'm sure you'll love your faxon. Just be sure to let me know if you're down to selling that ba barrel at a "defective" price. I have an 18" .223 wylde Hanson profile barrel from ba and it's an outstanding barrel.

  18. #38
    I put an upper together in 223 wylde with the same barrel and it is a shooter no doubt.
    My Faxon barrel will be here today, going to switch them out and then put the BA barrel up for sale
    Everything I enjoy doing is either illegal, immoral or, just to damn expensive

Posting Permissions

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