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AR-15 wont work 2
bambambam
Member Posts: 4,818 ✭✭✭
My barrel is chrome lined. So now what? Can't drill it?
I have a machinist drill index. These are all good bits, not hardware store junk.
I have a machinist drill index. These are all good bits, not hardware store junk.
Comments
Go back to square one. Get another upper and get the tooling from either Brownells or Midway, to do the job correctly. If you screw up the barrel you have now, your going to have to spring for another barrel, besides the upper.
I'm not spending $40-80 for a piece of plastic that I may use 1-2 times.
Obviously anyone can slap together an AR.....or not.
Live and learn.
Or change your forum name to BubbaBubbaBubba!![:D]
That way I wouldn't feel bad loaing it to my brother. (probably never get it back, not much he has ever 'borrowed" has ever returned)
I clamped the barrel in my v-block drilled the .057 port out to .073 one drill bit size at a time. I placed a aluminum cleaning rod inside the bore to prevent any burrs from forming. Worked really good.
I'm going to take it out and shoot it in about a hour or so. Lets you all know how it turns out.[:I]
I clamped the barrel in my v-block drilled the .057 port out to .073 one drill bit size at a time. I placed a aluminum cleaning rod inside the bore to prevent any burrs from forming. Worked really good.
If the gas pressure is to great because of the larger port size. BCG might cause problems do to much higher then normal operating velocity.
Brownells sells a gas block that is adjustable, so that gas pressure from the port can be regulated.
Lowers are a piece of cake to assemble because all there is are a few springs, pins, and trigger/hammer, especially if you have the vise-block to hold the lower. But the uppers may be tricky..especially if the vise blocks aren't used and improper torque is applied to the barrel during attachment. (In this case it might have ruined the upper receiver) When this happens things don't line up, tubes get bent, sights are canted, it doesn't run, on and on.
BBB, I dunno man; if you're opening up gas ports another 25% (+/-) wider-than-factory-spec, I see a myriad of issues down the road..including constant malfunctions from timing issues, increased wear on gas tubes, other damaged internals such as BCG damage, rapidly sheared bolt lugs, extractor failures, on and on.
As for the cleaning rod/"bore-burr" prevention, I am sure the aluminum rod fit snugly to the lands, but what about inside the rifling grooves? If not, the rod might prevent build-up on the flats (bearing surfaces) of the lands, but inside the grooves nothing is there to stop a ridge from building...until the burr ridge hits the surface of the rod (which is at land-height).
I wish you good luck on this one, and hopefully I'm all wrong on it and it comes together for you. [8D]
The gun now doubles on a single trigger pull? Run, don't walk, run to the nearest AR-15 qualified gunsmith and have it looked at. You're well on your way to a nightmare!
It will fire now, but every 7-10 shots it double fires.