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Posted: 9/24/2009 2:39:03 AM EDT
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Is it the same as a 5.56 barrel extension?
I have a Stag 6.8 upper that's slightly off center and requires the scope's windage adjustment to be maxxed out to be on target at 100 yds. Tools are on the way to pull and reseat the barrel, but just in case that doesn't work, I'm making a backup plan. I have a RRA .223 upper that's working fine. I never shoot the .223 past 100 yds anyway, so it's not such a big deal if it turns out that the receiver isn't true. Thinking about swapping the barrels. Will this work? |
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Quoted:
Is it the same as a 5.56 barrel extension? I have a Stag 6.8 upper that's slightly off center and requires the scope's windage adjustment to be maxxed out to be on target at 100 yds. Tools are on the way to pull and reseat the barrel, but just in case that doesn't work, I'm making a backup plan. I have a RRA .223 upper that's working fine. I never shoot the .223 past 100 yds anyway, so it's not such a big deal if it turns out that the receiver isn't true. Thinking about swapping the barrels. Will this work? Stag does not feel the need to put feed ramps on it's 6.8 caliber models, which is a serious lack of foresight. The center of the bullet tip sits lower than 5.56/223 loads, and there are definite feeding problems that have been noted with certain rounds and bullet types... |
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Quoted:
Is it the same as a 5.56 barrel extension? I have a Stag 6.8 upper that's slightly off center and requires the scope's windage adjustment to be maxxed out to be on target at 100 yds. Tools are on the way to pull and reseat the barrel, but just in case that doesn't work, I'm making a backup plan. I have a RRA .223 upper that's working fine. I never shoot the .223 past 100 yds anyway, so it's not such a big deal if it turns out that the receiver isn't true. Thinking about swapping the barrels. Will this work? 6.8 ammo being used? How does the 6.8 shoot with iron sights (do they also require a lot of windage adjustment)? Name and model of scope and mount/rings being used? 6.8 might only need a re-crown of its barrel muzzle. Leave the RRA in-tact. Consider contacting Stag for a replacement upper receiver after your barrel change tools arrive... |
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6.8 ammo being used? How does the 6.8 shoot with iron sights (do they also require a lot of windage adjustment)? Name and model of scope and mount/rings being used? 6.8 might only need a re-crown of its barrel muzzle. Leave the RRA in-tact. Consider contacting Stag for a replacement upper receiver after your barrel change tools arrive... thanks for the insight Chris––not having all the details, these are the same questions I would have asked. Here's why I'm convinced it's a barrel/receiver misalignment: SSA 110gr Prohunter and SSA 110 Barnes TSX factory ammo. I know that POI changes with ammo.....but not by 2' at 100 yds unless something is really wrong with it. This ammo is very consistent, producing 1.5 - 2" 10 round groups. (just far left) The irons also need to be maxxed to the left, same as the scope––-first thing I checked. (BTW, the scope in question is an ACOG TA01NSN––and it zeroes fairly close to mechanical center on a J&T 7.62x39, a Colt 6920, a Doublestar M4gery, and even on a home built FAL) Crown problem or a flash suppressor strike? As mentioned, this Stag shoots tight groups at all ranges I've tried it at.....just far left. A dinged muzzle or a FS strike usually won't group this well. (but, since that was a good question, I checked––-no problems with either. Crown is nice and sharp and square to the bore. No evidence of a strike on the FS either) I'm gonna pull the barrel, clean everything up and re-seat it first. I'm hoping it's just a chip or something went kittywhompus during the factory install––I needed the barrel nut wrench for my took kit anyway. If that doesn't fix the problem, I'll try swapping upper receivers. (to answer my own initial question, the barrel extension is the same, so if the swap turns out to be necessary, it'll be a simple job) I haven't decided what to do with the Stag upper if it turns out to be the problem. I'll probably take your advice and contact Stag for a replacement.....then sell it and get the Vltor I've been wanting. |
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square the receiver, get the tool from brownells or you could have it done on a lathe. 1" rod down the receiver bore and true the end at the threads. Thank you Sir! That's the kind of information I was looking for. (on a side note, if you had been offering your 6.8X43/ Recon/11.25x5R-NC/ Knurled free float model a year and a half ago, I wouldn't be dicking around with this Stag––-that's a helluva good price you have listed––only $100 more than my Stag cost. You're getting my business for the next build) |
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Quoted:
Quoted:
square the receiver, get the tool from brownells or you could have it done on a lathe. 1" rod down the receiver bore and true the end at the threads. Thank you Sir! That's the kind of information I was looking for. (on a side note, if you had been offering your 6.8X43/ Recon/11.25x5R-NC/ Knurled free float model a year and a half ago, I wouldn't be dicking around with this Stag––-that's a helluva good price you have listed––only $100 more than my Stag cost. You're getting my business for the next build) If you have trouble just give me a call, very few receivers are square but it could be the threads on the barrel and the extension is out of line with the bore. If you have 2 V blocks you could lay the barrel in the blocks and spin it slowly to see if the extension wobbles. Place something off the the side of the extension almost touching so you can see the movement. Same thing can be done with the receiver on but you need to watch the bore at the rear of the receiver for movement. |
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