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Thread: AR15 issues

  1. #1
    By Popular Demand gimp's Avatar
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    AR15 issues

    My AR isn't particularly reliable, I get a lot of failures to feed where the BCG either rides over the round entirely not picking it up, or it half picks it up but the round nosedives into the barrel extension.


    Carbine gas, 14.5", compensator, rifle buffer system, well lubed. Have tried 2 BCGs (Daniel Defense Milspec and DPMS), the DD one seems a little more reliable (Possibly due to being sllllightly heavier). Have tried several different mags, 2 types of factory ammo (60gr Belmont, 55gr Hornady (brass cased)). The Belmot seemed a little more reliable.


    I suspect it's overgassed but I'm not really sure. Any thoughts?


    The fact that I have an upper with M4 feedramps and a barrel extension without them can't be helping. The barrel work was done by Dan Hardy, I've though of sending the rifle up to him to fix it but I'd like to be able to use the damn thing while I'm here on break from work.

    Fuck custom rifles, next time I'm just going to deal with the customs hassle and get the barrel I want factory from the USA

  2. #2
    By Popular Demand gimp's Avatar
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    Would like to try a PRI adjustable low profile gas block if someone has one they can bear to part with....

  3. #3
    Official Cheese Shaman Spanners's Avatar
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    Tried putting upward pressure on the mag while rattling off rounds to test it.

    My H&K used to do it with a shitty mag.

    Just blend the extension to the upper with a dremel or something

    Where does it throw the brass?

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  4. #4
    By Popular Demand gimp's Avatar
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    Tried several different mags, magpul followers and shit


    Ejection is to about 6feet to 2 o'clock with DD BCG... interesting. Adjustable gas block I guess??


    Or send it back to Dan and say "Fix"

    What's an SSS spring?

  5. #5
    Official Cheese Shaman Spanners's Avatar
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    Personally I'd remove the gas block, measure the hole in it (from gas port), get a wee plug made up and press into it and drill hole 1/2 the size and test.
    Work it up with jet drills till you get what you want.


    The can will add bolt speed to it also so want it to operate just ok with no can on, then with can it will be sweeeeeeeet.

    SSS spring is Superior Shooting Solutions
    I think its a flat coil spring you can cut to suit

  6. #6
    By Popular Demand gimp's Avatar
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    I want it to function properly with and without can and with any factory ammo (Like a rifle should) so I guess I'll send it to Dan and say "it's fucked, make it work"

    Oh well another 2 months with no rifle

  7. #7
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    Now how the fuck are you going to come shooting up the valley Gimp? No .223 and your fucked!

  8. #8
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    Certainly does sound like too much gas getting through. Adjustable block would sort that. Try advertising around the forums & email the usual suspects who sell AR stuff. Serious Shooters had them but are showing out of stock. If you are really desperate you could try squeezing the gas tube a little to restrict the volume getting through. Just a little at a time as theres no going back. Good idea to have a spare tube before you start cos theres a good chance you will wreck it without fixing the problem.. A tip from Bubba gunsmiths Inc.

  9. #9
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    jp adjustable gas block - there was one on trademe recently but it may have gone

  10. #10
    Member Beavis's Avatar
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    I'd say either a shitty magazine or over gassed. Or both. The gas port hole in your barrel could have been drilled to wide. What do your feed ramps look like?



    Having your rifle over gassed will do nothing for bolt life either

  11. #11
    Official Cheese Shaman Spanners's Avatar
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    Plug it and drill the hole 2mm.
    Thats the size of the gasport in all my carbine barrels in which most went on to replace Hardy barrels with big port.
    2mm vs 3mm - 3mm isnt 50% more its 100% more area

  12. #12
    By Popular Demand gimp's Avatar
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    Quote Originally Posted by Beavis View Post
    I'd say either a shitty magazine or over gassed. Or both. The gas port hole in your barrel could have been drilled to wide. What do your feed ramps look like?
    Quote Originally Posted by gimp View Post
    Have tried several different mags,

    The fact that I have an upper with M4 feedramps and a barrel extension without them can't be helping.

    Quote Originally Posted by Wirehunt View Post
    Now how the fuck are you going to come shooting up the valley Gimp? No .223 and your fucked!
    It works most of the time. Fired the last few mags of the day with no problems

    Quote Originally Posted by muzr257 View Post
    jp adjustable gas block - there was one on trademe recently but it may have gone
    I need the PRI one or a similar lowpro one to fit under my handguard

    Quote Originally Posted by Spanners View Post
    Plug it and drill the hole 2mm.
    Thats the size of the gasport in all my carbine barrels in which most went on to replace Hardy barrels with big port.
    2mm vs 3mm - 3mm isnt 50% more its 100% more area

    How do I plug it? I've heard of people welding them but that doesn't seem like a great idea.

  13. #13
    By Popular Demand gimp's Avatar
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    To make an adjustable gas block you'd just have to drill + tap it for a set screw that would screw in/out adusting the amount of gas that can get through... right?

  14. #14
    Official Cheese Shaman Spanners's Avatar
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    You could just solder the gastube at the block end and just 2mm drill it.
    Beavis and Tone like this.

  15. #15
    By Popular Demand gimp's Avatar
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    Man I might try that

    ...got any spare gas tubes?


    I'll measure my gas port in a bit

 

 

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