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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Issue with short stroking
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<blockquote data-quote="ICANHITHIMMAN" data-source="post: 895928" data-attributes="member: 10414"><p>I'm trying not to contradict myself here and keep this all strait in my head, so bear with me. To answer the above question, I would say yes, based on my explanation from before in regard to bolt lock up. That said, consider the fact that your essentially changing out your rifle parts as you do your load work up, this has to effect something. </p><p> </p><p>I am a little fuzzy on what your rifle is no at this point and why you were swapping lowers to begin with? </p><p> </p><p>I was just reading back and I see you have a 16" barrel, with what I will assume is a carbine length gas system. When you swapped that upper with a lower configured for a rifle length spring and buffer, you over stressed the ability of your uppers gas system to operate the bolt of your rifle. The 16" barrel with a carbine length gas system and carbine sized gas port will not generate enough internal pressure to effectively unlock and lock the rotating bolt on your weapon, thus leading to your short stroking and possibly effecting your group size.</p><p> </p><p>I would suggest starting over, you have to many variable's at play to effectively diagnose your issue. Return the rifle to the configuration it was in when you got it. Then we can go over the rifle and correct any issues it had from the factory, to help you eliminate any reliability and accuracy issues you have. I will tell you right now, based on your rifles manufacture that your bolt carrier key is not properly staked and that will in my experience most likely hold true for your butt stock retaining nut as well, but they are both issues you can fix at home. I will also go ahead and say your factory spring and buffer are junk! It will not be marked, if it is I will be shocked! Take the spring out and measure it, if its between 10 1/16 Inches (25.56 cm) minimum and 11 1/4 inches (28.58 cm) maximum, then its good to go, if not replace it with one of known quality. Then look at your buffer if its stamped it should say H, but if its says H2,3,4,5 etc. your ok as well, they get heavier as the number increases. If its not stamped then replace it with one that is, they are usually sold together and I would suggest one from Bravo Company USA.</p><p> </p><p>I know I'm getting long winded, next lets consider the rifles purpose. You bought an off the shelf Bushmaster carbine, they usually come with a 1-9 twist, 223 Remington chamber and standard carbine hand guards, that means your have to be cognizant in your choice of bullet weights and charge weights. <strong>NEVER USE LOADS DESIGNATED AS 5.56 NATO IN YOUR GUN, </strong>your chamber is to tight to handle the pressures of 5.56 NATO safely. Your rifle more than meats its requirement's as far as accuracy goes, can you make it better, hell yes! Consider a new hand guard, one that allows the barrel to free float, do a trigger job, either by shooting the rifle or polishing the internals. oil the crap out of your bolt and bolt carrier, I use Mobil one but any synthetic motor oil is a good choice.</p></blockquote><p></p>
[QUOTE="ICANHITHIMMAN, post: 895928, member: 10414"] I'm trying not to contradict myself here and keep this all strait in my head, so bear with me. To answer the above question, I would say yes, based on my explanation from before in regard to bolt lock up. That said, consider the fact that your essentially changing out your rifle parts as you do your load work up, this has to effect something. I am a little fuzzy on what your rifle is no at this point and why you were swapping lowers to begin with? I was just reading back and I see you have a 16" barrel, with what I will assume is a carbine length gas system. When you swapped that upper with a lower configured for a rifle length spring and buffer, you over stressed the ability of your uppers gas system to operate the bolt of your rifle. The 16" barrel with a carbine length gas system and carbine sized gas port will not generate enough internal pressure to effectively unlock and lock the rotating bolt on your weapon, thus leading to your short stroking and possibly effecting your group size. I would suggest starting over, you have to many variable's at play to effectively diagnose your issue. Return the rifle to the configuration it was in when you got it. Then we can go over the rifle and correct any issues it had from the factory, to help you eliminate any reliability and accuracy issues you have. I will tell you right now, based on your rifles manufacture that your bolt carrier key is not properly staked and that will in my experience most likely hold true for your butt stock retaining nut as well, but they are both issues you can fix at home. I will also go ahead and say your factory spring and buffer are junk! It will not be marked, if it is I will be shocked! Take the spring out and measure it, if its between 10 1/16 Inches (25.56 cm) minimum and 11 1/4 inches (28.58 cm) maximum, then its good to go, if not replace it with one of known quality. Then look at your buffer if its stamped it should say H, but if its says H2,3,4,5 etc. your ok as well, they get heavier as the number increases. If its not stamped then replace it with one that is, they are usually sold together and I would suggest one from Bravo Company USA. I know I'm getting long winded, next lets consider the rifles purpose. You bought an off the shelf Bushmaster carbine, they usually come with a 1-9 twist, 223 Remington chamber and standard carbine hand guards, that means your have to be cognizant in your choice of bullet weights and charge weights. [B]NEVER USE LOADS DESIGNATED AS 5.56 NATO IN YOUR GUN, [/B]your chamber is to tight to handle the pressures of 5.56 NATO safely. Your rifle more than meats its requirement's as far as accuracy goes, can you make it better, hell yes! Consider a new hand guard, one that allows the barrel to free float, do a trigger job, either by shooting the rifle or polishing the internals. oil the crap out of your bolt and bolt carrier, I use Mobil one but any synthetic motor oil is a good choice. [/QUOTE]
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AR15/10 Rifles
Issue with short stroking
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