NEW BUILDS-FTF on one, first round bolt jamed on other.
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Thread: NEW BUILDS-FTF on one, first round bolt jamed on other.

  1. #1
    NoWorkCamp4Me railbuggy's Avatar
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    Default NEW BUILDS-FTF on one, first round bolt jamed on other.

    I took my three most resent builds to the country yesterday for a test fire. One worked fine. One jammed up after the first round, and the other had FTF issues. I hade to cycle it like a bolt action each shot. I had a used 30rd BFI magazine in the rifle that jammed after the first round was fired. I could not work the action so that rifle went back in the car. The next rifle tested with that mag acted like it was short stroking. It would fire each round but would not feed the next. It to was placed back in my car. I was using the cheap TulAmmo ammo from Walmart. Shortly I plan to return to my friends house in the country with the two rifles that gave me trouble. I will load the used BFI mag with new brass case ammo to see if the mag is bad. The other magazines will be new D&H mags with the PSA stamp on them, and 30rd PMAG. Not the new ones. All three rifles have 16" barrels and Anderson lowers.
    SOON-We already lost the war. You are the resistance.

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    in the blueridge mtns nutznboltz's Avatar
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    Rails? Describe jammed please. Did you assemble the uppers or buy pre built?
    Using standard lower parts? Hammer spring in the right place? Hows the bolt extractor spring? Invest in the ARs. It'll save you long term.
    And Gary Willard does a great job on uppers. He's spoiled me from building my own.

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    in the blueridge mtns nutznboltz's Avatar
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    Don't forget to download the M16 armorers manual. You can find it free.
    Bought a paper version in the 80's. Good advice on torque specs.
    Tommo likes this.

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    Gunco Good ole boy tanvil's Avatar
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    Mo details Rails on that ftf rails.

    Also for the one that acted like it short stroked.

    Were these complete uppers or did you put them together from various parts?

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    GuncoHolic Sprat's Avatar
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    first
    clean the chamber and bore real good Chuck a bore brush say 9mm or 40 cal in a hand drill and with some oil scrub that chamber and throat, then clean the chamber also oil the new bolts up good break down and buy some american made 223 winchester, federal or remington only use that russian junk for plinking not testing

    I do not use those aftermarket mags, I use 20rd military surplus mags. 20rd GI mags NEVER JAM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    if none of this works, you may have headspace issues
    nutznboltz and Akfite like this.
    Sprat and sprat1 are one and the same.

  7. #6
    in the blueridge mtns nutznboltz's Avatar
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    My biggest stack of mags are 20 rd Colts If they didn't run? Just toss it. Grab another one. Old days tho.
    Download the armorers manual dude. Or swap uppers. Or just send me the ones that don't work.

  8. #7
    NoWorkCamp4Me railbuggy's Avatar
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    I believe it had something to do with the Russian ammo. I loaded the offending used BFI magazine with American made .223 factory reloads today and the one rifle fired fine. The bolt was wet. The other rifle failed to fire and left no mark on the primer. I took the bolt out and saw that the tip of the firing pin would not move forward enuff to strike the primer. This bolt was dry and I had no oil to hit it with. I switched bolts and the rifle fired. Not sure how the jam happened yesterday, but in the field I could not work the charging handle to extract the spent round. I had no jam today. After I got home yesterday I removed the lower from the jammed rifle, hit the charging handle with a wood dowel and the bolt carrier broke free. I have no idea what the problem was. I have a old colt 20rd GI mag with 20rds of steel TulAmmo in it. It fired fine today. I loaded some D&H 30s, some Magpul 30s, and the BFI 30 with brass cased .223s today. Both rifles worked as they should with the good BCG. My digital caliper needs a battery. I will mic both firing pins after I get the button battery. I don't know what was up with the FTF yesterday. The rifle would fire each round, but would not load a new round without working the charging handle again. Is there a difference between M16 and AR15 bolts. I believe all my builds have M16 BCGs. That short firing pin did work yesterday at least once.
    Last edited by railbuggy; 05-08-2017 at 09:50 PM.
    SOON-We already lost the war. You are the resistance.

  9. #8
    in the blueridge mtns nutznboltz's Avatar
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    Okey dokey. You were a Marine. Right? Army guys had to "shotgun" their weapon. Which included pulling out the BCG assembly and slinging it forward for the lubricated bolt to slap out of the carrier. While sarge ran the cleaning rod up the barrel. Shotgunning meant to break open the 16,remove the BCG with charging handle slightly back. Enjoy your toys and drop and give me 25 pushups.

  10. #9
    aka: SDK1968 dutigaf's Avatar
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    couple of things for you to check..

    SPrat hit it on the drill with bore brush for the chamber... i do this all the time.

    next on the "short stroking"... my good friend Gary Willy taught me that if you think you have short stroke or ammo issues the easy way is to just chamber one round & fire it.

    if it blows back & locks open? you aint got short stroke issues. :-)

    if it doesnt? then repeat the test with different ammo to see if its ammo or gas issue.

    lastly would be those mags causing drag or stick situations.
    Hate takes LESS energy & thought... Dont be so Lazy.

    Building or Bitching? which are you here to do?


    YES, i work for TEC Tactical. 02/07 SOT


  11. #10
    NoWorkCamp4Me railbuggy's Avatar
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    May never know what caused what yesterday. The three AR15 rifles were assembled by me in this condo I moved into last May. I forgot to inspect and oil them before we went shooting yesterday. All three function as they are sapost to except for that BCG with the short firing pin. None of the local parts shops I called had a M16/AR15 firing pin. I'll need to order one on the net. I have half the parts I need to build #6, so I might as well order a new BCG with a extra firing pin.
    Last edited by railbuggy; 05-09-2017 at 08:41 AM.
    SOON-We already lost the war. You are the resistance.

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