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Thread: 7.5 inch AR-15 reliability

  1. #71
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    Quote Originally Posted by shadow65 View Post
    I'm trying out a 7.5" piston upper to see if it helps with the dirt issue.
    Which one are you trying out? I have shot out the bore on my 7.5" AR and I am looking at options to replace it. The main reason I run the 7.5" AR is because of back/wrist issues and I am really not convinced on the piston systems because of the extra weight of the piston systems (or at least on the ones I have played with).

    Example: I am having surgery on my wrist this week, I will be running two classes in February with limited to no use of my support side. One of them I will probably be wearing a cast for so my top concern is a very light rifle.
    Omi R.

  2. #72
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    Quote Originally Posted by shadow65 View Post
    Rifle round will always beat a hand gun round. Will that 9mm defeat body armor? The 5.56 will

    A 7.5" 5.56 is not the ideal HD weapon by any means. Inside a house, I would more likely use my Glock.
    But except for the blast, I don't buy the rest as a reason not to use it if it's what you have.
    Plenty accurate to 100 yards.
    Short barrelled ammunition would help with the concussion and blast.
    Trust me, a 9mm is also loud in an enclosed room.
    It's not what I would recommend for HD but I'm not convinced it wouldn't serve the purpose, with the exception of decibals.
    Dave
    Hence why I have it setup with a can. With the benefit of the can I think it far surpasses my G19 for HD. Now the G19 will always be my go to gun, initially. But you can bet your ass that if I can get to my 7.5" AR I will use that instead.

    To me a persons goto gun has everything to do with what is their primary training gun in confined areas. To me its a close tie between my AR and G19.
    Omi R.

  3. #73
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    Quote Originally Posted by miamitj View Post
    I really want to see a response to this but I feel its just not going to happen.
    I figured as much.

  4. #74
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    Quote Originally Posted by miamitj View Post
    Hence why I have it setup with a can. With the benefit of the can I think it far surpasses my G19 for HD. Now the G19 will always be my go to gun, initially. But you can bet your ass that if I can get to my 7.5" AR I will use that instead.

    To me a persons goto gun has everything to do with what is their primary training gun in confined areas. To me its a close tie between my AR and G19.
    Mine is also set up with a can. I use a .308 SAS. It's longer and heavier but it's built like a tank and does a good job suppressing the 5.56 out of the short barrel. The combo is still the same size as a 16" upper without a flash hider.

    I'm testing a CMMG 7.5" piston upper with the suppressor. Recoil isn't bad at all.
    I'm running an H2 buffer.
    I had less crap in the receiver after 200 rounds suppressed too. I sent the first one back to see if we can get a longer hand guard set up.

    Dave
    Last edited by shadow65; 01-16-11 at 15:42.
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  5. #75
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    Quote Originally Posted by Iraqgunz View Post
    My two cents on the issue. When I was in Iraq a few guys had DPMS 7.5" guns and they didn't always run so good.

    The dwell time and cycle of operation is violent and brutal. Some of them may run good, but I just don't see the real value in it. I would much rather have an additional 3 inches of barrel that will give me more reliability and better ballistics. Not to mention most all suppressor manufacturers will not warranty their cans on 7.5" barrels.
    A person would have to be out of their head to run a 7.5" AR15 in a combat zone. Doubly so for a DPMS product.

    I'm a few years from considering post military career paths (though I did have a good convo with Dyncorp recently) but if I were going overseas as a contractor I can't imagine going any shorter than a 10.3" barrel. More likely, I would want a Colt Commando for the extra reliability of the 11" barrel.
    Kein Mitleid Für Die Mehrheit
    What Happened to the American dream? It came true. You're looking at it.

  6. #76
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    Totally agree.
    I would never carry shorter than a 10.3" in a combat zone.
    My 11.5" has never missed a beat. Oddly, my 10.5" has better accuracy.
    Last edited by shadow65; 01-16-11 at 16:27.
    Independent Field Testing/R & D

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  7. #77
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    Quote Originally Posted by miamitj View Post
    Really? Not enough lethality? I have never said the 7.5" is the gun to use at 150 yards but I guarantee you that my 7.5" AR will be plenty lethal. The way I have it setup for HD, suppressed, I guarantee you it will cause more damage then my G19. Whenever you want to test if for yourself just come into my house uninvited one night.

    ETA: most importantly, it WILL penetrate body armor.

    As asked elsewhere, what real world experience do you have?
    Do you actually think robbers with body armor are going to come to your house? Mall ninja much? What I type below is more written for an actual unit or PSD, not for some cowboy home defense. Dude.. Get a 12GA. Your leet AR weighs almost the same as the Benelli M1014 I was issued. I will throw my semi auto 12GA up against some 7.5 AR any day. Ill bring slugs for the magical pixies with armor too!

    The thought of bringing 3 more inches with a 10.5-11.5 inch gun is the way to go for an AR. I just made the case that a full size AKs-74 is also 3 inches longer with the stock folded. It is long enough to conceal under a longer jacket still. I hate to show a movie reference as an example of a certain scenario and gear selection but the bank heist in Heat is a good example of how small some of those rifles are and how easy they are to conceal.

    If you are going to dabble in 5.56 with a little 7.5 inch barrel you might as well just use 5.7x28... That at least takes care of the deafening concussion and the concealability. The overall length of a P90(under 20 inches with a 10+ inch barrel) and the 50 round mag make up for a few of the AR's short comings with that short of a barrel. We all know the KAC PDW is tits, but ammo and mags are not exactly available everywhere.

    I have fired a real MP5. You can wear all the body armor you want. Unless you are wearing it on your head you got real problems. I will not even go into the argument of sound level when things like the SD6, MP5/10, and UMP exist. 9mm/10mm/45acp can get the job done in that range. The P90 isn't my first choice, but I would rather have it than some 7.5 AR. And the Glock 19 with 33 rounders clearly has an edge in concealment and weight over some 25 inch long ar. One person could carry 4 loaded Glock 19s with 33 rounders for that same weight. Hell The Glock 21SF with the 30 round vector extensions works too. 30 rounds of 45 ACP ends fights less than 50 meters.

    All of those options are lighter, quiter, shorter and have better ballistics.
    Hi cap pistols: Glock 19/ all the others
    Subs with extending or folding stocks: MP5/UMP/AK74u
    PDWs: P90/KAC PDW/MP7
    Shorter Rifles with folding stocks: G36c/AK/Galil/FNC /FAL/G3/Sig 552/HK33/ and more
    Last edited by fhpchris; 01-16-11 at 18:05.
    USMC vet.

  8. #78
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    How many of the weapons you listed have the capability of changing calibers or barrel lengths by removing 2 pins?
    That is the beauty of the AR platform. If you want to use a 7.5" set up, you can without dedicating a lower to it.
    I take 3 or 4 uppers to the range with one SBR'd lower.

    But this is way off subject.

    The 7.5" is lethal, it's not a toy.
    It's loud and the concussion is terrible in an inclosed area unless suppressed
    The 7.5" 5.56 doesn't have the over penetration that some pistol rounds do.

    Always pro's and Con's.
    Independent Field Testing/R & D

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  9. #79
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    RFK was killed with a Iver-Johnson Cadet revolver, I guess that makes a .22 lethal enough...right?

    All firearms are lethal, so that isn't much of a proving point...
    Last edited by variablebinary; 01-16-11 at 18:05.
    Kein Mitleid Für Die Mehrheit
    What Happened to the American dream? It came true. You're looking at it.

  10. #80
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    Quote Originally Posted by shadow65 View Post
    How many of the weapons you listed have the capability of changing calibers or barrel lengths by removing 2 pins?
    That is the beauty of the AR platform. If you want to use a 7.5" set up, you can without dedicating a lower to it.
    I take 3 or 4 uppers to the range with one SBR'd lower.
    So when someone breaks into my house I need to break out the SR15, take the upper off. Find my 7.5 SBR upper (all us leet commandos have multiple SBR uppers for the exact perfect situation!) find the correct magazine! (dont wana confuse the loaded 6.8 SPC ones from the 5.56 ones!) put it all together, pray the eotech is zeroed(I cannot afford 2000$ of eotechs for each upper) and has batteries and go fight! (all the while praying that I loaded my MK262 in the FDE pmags and not the Black pmags that have M193 in them! Don't wana mess that up at 3am in the dark with little time to ninja assemble my 7.5 inch PDW of DEATH!)

    ...Or I could pick up a loaded shotgun before some punk with a .380 shoots me while Im assembling my leet super mall ninja home defense SBR.
    But this is way off subject.
    Got that right!

    The 7.5" is lethal, it's not a toy.
    It's loud and the concussion is terrible in an inclosed area unless suppressed
    The 7.5" 5.56 doesn't have the over penetration that some pistol rounds do.

    Always pro's and Con's.
    It does not have the ballistics to actually do massive damage either.

    I love my ARs but I bet 99.7% of us here would reach for a 12ga or 1911 over some micro short SBR for home defense. All the while citing 7.5 AR-15s as massive deadly weapons over these small pussy pistol calibers right?

    If you are a member of a SRT/SWAT team than this situation does not apply to you.

    You just cited a 8+ lb 7.5 inch AR-15's positives as low penetration over a 12GA? ROFL? I do not know what to say.
    Last edited by fhpchris; 01-16-11 at 18:26.
    USMC vet.

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