Ar15 accuracy upgrades
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Old 05-24-2014, 12:53 AM   #1
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Default Ar15 accuracy upgrades

I have a bushmaster xm15 patrol mans carbine and was wanting to get better accuracy out of it (223) I was wondering if anybody had any clues on how to get better accuracy out of it , it has the standard 16.5" barrel on it stock bolt also a ATN mk390 night optic on it very crisp clean rifle I was wondering if there was any quick and under about 200$ upgrades to get better accuracy and distance on it please and thankyou
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Old 05-24-2014, 01:03 AM   #2
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I have a bushmaster xm15 patrol mans carbine and was wanting to get better accuracy out of it (223) I was wondering if anybody had any clues on how to get better accuracy out of it , it has the standard 16.5" barrel on it stock bolt also a ATN mk390 night optic on it very crisp clean rifle I was wondering if there was any quick and under about 200$ upgrades to get better accuracy and distance on it please and thankyou
change to a free floating handgaurd
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Old 05-24-2014, 01:04 AM   #3
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Is that going to add much or ?
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Old 05-24-2014, 01:14 AM   #4
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Is that going to add much or ?
a little. not tons. also could change the trigger. but that doesnt mean its going to make your rifle more accurate, just means you will have a better trigger that with practice could make you and your rifle more accurate together.

not sure of your skill set but most rifles will shoot better once the shooter becomes proficient with said rifle.
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Old 05-24-2014, 01:22 AM   #5
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I am proficient with the rifle I can (not using night scopes) put on my Nikon scope and shoot 250yard 6" groups (not great but) all day long but I want to be able to make the 500+ shots though
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Old 05-24-2014, 01:23 AM   #6
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What kind of accuracy are you getting now?

What kind of ammo are you using now? Having a load that YOUR rifle likes makes a big difference.

Do you have a day optic? Being able to have a consistent aim point is important.

How are you shooting it when you are judging the accuracy? (Standing, benched, prone, using a sling, a bipod?). Keeping pressure off the barrel is important.
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Old 05-24-2014, 01:27 AM   #7
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Well you just answered a couple of my questions while I was typing.
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Old 05-24-2014, 01:28 AM   #8
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Bipod (bayonet lug) I am shooting hornady 75 grain bthp rounds and yes a Nikon 9-14 40 mm
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Old 05-24-2014, 02:18 AM   #9
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What is your rate of twist? Isn't 75 a heavy grain for 223? Also, you might get better accuracy out of a 20" barrel (I believe it takes a 20" barrel to burn all the powder, correct me if I'm wrong.) I have no idea how much that would cost you though.

Maybe you should just put the $200 into more ammo and keep on training, that might make the biggest difference of all. Goodluck, and let us know what you do
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Old 05-24-2014, 05:10 AM   #10
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Bipod (bayonet lug) I am shooting hornady 75 grain bthp rounds and yes a Nikon 9-14 40 mm
So, as I was saying, barrel harmonics can play an important part in repeatable accuracy by allowing the barrel to vibrate the same for each shot. One of the worst effects on accuracy can come from putting pressure on the end of the barrel, and having that pressure change with each shot. A bipod at thatched to the bayonet lug will not be great for accuracy. If a shooter wants to use a bipod or a sling for stability it is best to have those attached to a free floating handguard. This allows the barrel to move freely and consistently for each shot.

Also on heavy bullets and twist rate: most Bushmaster barrels will have a 1:9 twist. This means it will make the bullet make a complete rotation as it travels forward over a distance of 9 inches. This twist rate will usually stabilize .223 cal bullets up to a weight of 68gr. Some 1:9 twists will stabilize some manufacturers bullets up to a weight of 75 gr but it may be pushing the edge of stabilization. For bullets of 75 gr and heavier a 1:8 or 1:7 twist is better.

The 16" barrel is capable of accuracy out to 500-600 yds, but you will not have optimal velocity for keeping heavy bullets stable. Also with the lower velocity you will experience more drop at 500 yds.

F you want long range accuracy I would take the 200 bucks and save it. Then apply it to a separate upper half that is made with long range precision in mind. This way you have your carbine upper for quicker handling and shorter range shooting, and a precision upper for your longer range shots. A good 20" 1:8 twist match grade barreled upper with a floated handguard will make a big difference.
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