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Posted: 7/24/2015 1:01:58 PM EDT
[#1]
i can hit 6"gong at 50yrds and 8" gong at 100yrds with red dots on both my 7.5" pistols. one is 5.56 the other is x39
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Posted: 7/24/2015 2:57:37 PM EDT
[#2]
Quote HistoryQuoted:
i can hit 6"gong at 50yrds and 8" gong at 100yrds with red dots on both my 7.5" pistols. one is 5.56 the other is x39 What about groupings? |
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Posted: 7/24/2015 4:19:58 PM EDT
[#3]
Accuracy has little to nothing to do with barrel length. Accuracy is dependent upon the ammo, the quality of the barrel, the sighting system, and the nut behind the trigger. Only velocity is dependent upon barrel length.
Barrels are made long to maximize velocity. They are made heavy to offset effects of heat causing minute warpage and therefore stringing of groupings. A barrel that short though will not be as adversely affected by heat as short is also stiff (insert phallic pun here). So ultimately, assuming you have a match-quality barrel, with the right glass and right loads MOA is just as likely with a 7.5 as with a 17.5" barrel. The difference will be where the impacts are, and effective range of them. |
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Posted: 7/24/2015 5:08:14 PM EDT
[#4]
Quote HistoryQuoted:
Accuracy has little to nothing to do with barrel length. Accuracy is dependent upon the ammo, the quality of the barrel, the sighting system, and the nut behind the trigger. Only velocity is dependent upon barrel length. Barrels are made long to maximize velocity. They are made heavy to offset effects of heat causing minute warpage and therefore stringing of groupings. A barrel that short though will not be as adversely affected by heat as short is also stiff (insert phallic pun here). So ultimately, assuming you have a match-quality barrel, with the right glass and right loads MOA is just as likely with a 7.5 as with a 17.5" barrel. The difference will be where the impacts are, and effective range of them. That's what I figured. I can shoot a grouping the size of a quarter with my 14.5 and 16 inch ARs at 50 yards. This little pistol is just all over the freaking place. It drives me nuts. Any ideas? |
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Posted: 7/24/2015 5:39:15 PM EDT
[#5]
You haven't given any details on the pistol so no suggestions are possible at this point.
Well you did say it was a 7.5" Anderson (a.k.a. budget)barrel. Barrel and ammo are the top two and most important factors in accuracy and/or precision in the AR platform, not good areas to go low budget. ETA: Any builder or manufacturer that claims their firearms never need lubrication I steer well clear of. |
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Posted: 7/24/2015 6:57:08 PM EDT
[#6]
I probably got a bum barrel. Lame. I did have the chamber polished. I only have about 300 rounds through it.
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Posted: 7/24/2015 7:08:26 PM EDT
[#7]
No need jump to conclusions. What are the circumstances of the build? Did you build the upper? What kind of sights? how are they mounted? A loose barrel nut, sights or optics that won't hold zero or are loose and shifting. Shifting/loose handguard with the front sight mounted to it. There are a number of reasons that your getting the results you are. But without details of the firearm we can offer no possible diagnosis or remedies.
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Posted: 7/24/2015 7:23:38 PM EDT
[#8]
Loose barrel but, try different ammo.
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Posted: 7/24/2015 8:46:05 PM EDT
[#9]
I could not believe the accuracy I got out of my $84 X39 7.5 inch barrel pistol. Out to 150 is very accurate.
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Posted: 7/24/2015 9:23:55 PM EDT
[#10]
I took a 7.5 to 200m years back. It was AK accurate. Beyond that it was garbage.
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Posted: 7/24/2015 10:17:52 PM EDT
[#11]
Quote HistoryQuoted:
No need jump to conclusions. What are the circumstances of the build? Did you build the upper? What kind of sights? how are they mounted? A loose barrel nut, sights or optics that won't hold zero or are loose and shifting. Shifting/loose handguard with the front sight mounted to it. There are a number of reasons that your getting the results you are. But without details of the firearm we can offer no possible diagnosis or remedies. i put it together myself. built lots of ARs but this one has just been a pain in the bum from the beginning. i finally got all the bugs worked out and now it doesn't shoot worth a darn. just built it to have fun. mbus front and rear with an eotech xps2. 
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Posted: 7/25/2015 12:15:53 AM EDT
[#12]
Wife has a RRA 7.5". It is surprisingly accurate. No problem ringing a 10" steel plate from 200 yds with almost boring regularity. It's the one in my avatar BEFORE she picked out all the goodies for it
 .
After the goodies: 
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Posted: 7/25/2015 1:59:07 AM EDT
[#13]
What ammo?
Try match ammo. Try removing the brake. Try removing stuff from the fore end. |
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Posted: 7/30/2015 10:11:20 AM EDT
[#14]
With mine,using loads not developed for accuracy I get 2-3 moa to 100yds, at 200 I can hit a 10" plate most of the time but I have to hold over for 8" of drop.
My defensive loads designed solely for expansion/penatration happened to be just under 2moa at 50yds which I consider about max effective range for them. I am using an eotech with 3.5x mag at the 100-200ranges. |
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Posted: 7/30/2015 3:11:27 PM EDT
[#15]
May also want to inspect the crown and as someone else mentioned try it without the Kx5 and some better quality ammo.
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Posted: 7/30/2015 3:14:11 PM EDT
[#16]
My 7.5 SBR with Eotech and KX3 will group about 3" with decent ammo at 100yd, but most of that is probably from going crosseyed with the Eotech
I may throw a scope on it one day to see what the barrel is actually capable of. Black Rain / BHW SS 1:8 barrel |
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Posted: 7/30/2015 3:14:35 PM EDT
[#17]
Quote HistoryQuoted:
May also want to inspect the crown and as someone else mentioned try it without the Kx5 and some better quality ammo. The crown of any barrel I didn't make is suspect, and the number one place I'd start. Could be a horribly crooked chamber, extremely out of tune gas system, or even a badly dimensioned barrel. |
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Posted: 8/1/2015 1:04:49 AM EDT
[#18]
When I do my part, I get cloverleafs.
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Posted: 8/2/2015 4:10:47 PM EDT
[#19]
You might consider getting with Anderson and having the bbl checked out. My 7.5 Anderson came with a bad chamber that stuck rounds and had a nasty ridge in it that left quite a mark on the brass and my laser sight. Someone stopped the hone just a tad short of completion. I got 2 rds through it on my first firing and had to take it home with a round stuck in the chamber, which I was able to remove by gently tapping on the charging handle with a small leather hammer. Anderson was very responsive, sent me a UPS shipping label and properly honed the chamber for me. It functions fine now. I have only grouped it at 50ft, which is good enough for now... my house is only 28ft long and it's in a readily available location......
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