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Thread: 7.5 inch AR-15 reliability

  1. #101
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    Not sure why it was closed to be honest .... But anyway to be on topic and more precise on my response.

    As I've noted before, my setup has worked flawlessly for me for years through an absurd number of rounds and over 10 carbine courses with various instructors.

    I think what it comes down to is finding the right setup. Maybe I got lucky but it works, and works very well.
    Omi R.

  2. #102
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    I think the key to mine is the small gas port. Still don't know how Rainier accomplishes this. I get a lot less crud back in the receiver. Recoil isn't bad at all on it. I've not fired many suppressed through it but I'm sure it will get dirtier than the piston set up.

    Update. I initially said it ran from the first shot. After going back through my review, I had a couple of double feeds on break in, and I believe those were related to the old 20 round G.I. mag.
    No issues since.
    Dave
    Last edited by shadow65; 01-17-11 at 19:21.
    Independent Field Testing/R & D

    Better to die for something than live for nothing

  3. #103
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    Thanks for you two guys experiences.

    How about those of others with personal experience with 7.5's?
    Last edited by Zeus; 01-17-11 at 20:13.
    Remember, the Founding Fathers reason for the 2nd Amendment... to combat tyranny. Sadly, when people discuss the 2nd Amendment, the opponents erroneously think it was meant to stand alone... it HAS a preamble:

    "...But when a long train of abuses and usurpations, pursuing invariably the same Object evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security..."

    — John Hancock

  4. #104
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    Just to add, my first 7.5" 5.56 was a DPMS Kitty Kat.
    I did have to open the gas port to .078 (I believe) for it to run reliably.
    Extraction problems were solved with a BCM extractor spring up grade (highly recommended).
    Independent Field Testing/R & D

    Better to die for something than live for nothing

  5. #105
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    I own a 7.62 Krinkov AK SBR (8" barrel) but would be very hesitant about using it for HD due to concerns about overpenetration (which I have witnessed first hand). On the other hand, an equally short (or almost as short) 5.56 SBR, preferably suppressed, would be my first choice because the overpenetration would be somewhat mitigated. Since I need to keep the OAL down with the suppressor attached, this has lead me to 8" piston ARs (such as the LWRC PSD, Barrett REC7 PDW, etc.). Yes, I know that the ballistics won't be "as good" as with a 6.8 gun, but in a sense, that's what I'm looking for. Keep it short and keep it suppressed. At least, that's my thinking. Haven't taken the plunge yet. Oh, and for the suppressor, I'm looking at the AAC 762-SDN-6 which is designed for extremely short barrels (as well as longer barrels) and works on 7.62, 6.8, and 5.56.

  6. #106
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    Reliability would strike me as being paramount since an AR with a barrel shorter than 10.3 is as usless as tits on a lightening bolt for duty/defense.

    Who cares if a silly range toy hickups every now and then.
    "You people have too much time on your hands." - scottryan

  7. #107
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    Quote Originally Posted by markm View Post
    Reliability would strike me as being paramount since an AR with a barrel shorter than 10.3 is as usless as tits on a lightening bolt for duty/defense.
    I absolutely agree. However I have read about no ongoing reliability issues with the LWRC PSD. Quite the opposite actually. I'm still in the info gathering stage though, so perhaps I will stumble onto something prior to making a purchase.

  8. #108
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    Good LAWD! You guys crack me up. If miamitj is happy with his MS1 7.5" let him be. You may not like the 7.5" based on what you've read and heard about framentation, expansion, but fact is, a lot of people have been killed by much less (.22 LR). I've always liked the compactness of the 7.5" and the only reason that I don't have one is that I'm too busy buying 14.5" middies (love that combo) and working on a .308 project. If I had the extra smack, I would get a 7.5" upper. I don't know about any of you guys, but I certainly wouldn't want to be shot with miamitj's useless little 7.5", or anyone's for that matter. Also, I wouldn't imagine that if someone broke into his home, that he would just shoot them one time and watch to see if it had any effect. He'd probably shoot them 4-5 times and probably in the face. Now can anyone here seriously say that usn't lethal... even if it was M855 62gr FMJ?
    "I stayed at a Holiday Inn Express last night..."

  9. #109
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    As far as the comment about not being taken serious for using a YHM Rail, well that is probably one of the most elitist & assinine comment I've seen on the Interwebs. Maybe you should tell Paul that he shouldn't be taken seriously because he uses the same rail.



    Gear doesn't make the man...
    Last edited by The Archangel; 04-29-11 at 14:06.
    "I stayed at a Holiday Inn Express last night..."

  10. #110
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    Quote Originally Posted by The Archangel View Post
    Good LAWD! You guys crack me up. If miamitj is happy with his MS1 7.5" let him be. You may not like the 7.5" based on what you've read and heard about framentation, expansion, but fact is, a lot of people have been killed by much less (.22 LR). I've always liked the compactness of the 7.5" and the only reason that I don't have one is that I'm too busy buying 14.5" middies (love that combo) and working on a .308 project. If I had the extra smack, I would get a 7.5" upper. I don't know about any of you guys, but I certainly wouldn't want to be shot with miamitj's useless little 7.5", or anyone's for that matter. Also, I wouldn't imagine that if someone broke into his home, that he would just shoot them one time and watch to see if it had any effect. He'd probably shoot them 4-5 times and probably in the face. Now can anyone here seriously say that usn't lethal... even if it was M855 62gr FMJ?
    Ain't it the truth!! One of my SBR AR's has a 7.5" bbl made by Ballistic Advantage. I then added a bunch of Magpul accessories to it, with a couple finishing touches by Spike's Tactical and put an Eotech sight on it. I love the little rifle. It's fun, and I sure as hell wouldn't want to be shot by it!! As the saying goes, I'd rather be missed by a .45 than hit by a .22!! A short SBR with a 7.5" bbl is still a DEADLY WEAPON. It can and will kill you if shot by it!! I wouldn't use it for counter sniping, but for home defense, why not?!? A super short barrel doesn't change a .223 into a BB gun.
    May God have mercy on my enemies, because I won't.

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