Jump to content

AR uppers

Squirrely

By Squirrely
in The Off-Topic Bar

Recommended Posts

Squirrely Enthusiast

Squirrely

Posted
Posted

Anyone here build them. I have a question or two.

 

Mostly, I'm having trouble getting the barrel to seat flush with the upper receiver. What's happening is a slightly canted barrel. So to sight in you have to crank everything to the right.

 

Am I missing a trick here?

Squirrely Enthusiast

Squirrely

Posted
  • Author
Posted

After some research.

 

I guess I will need to take my upper apart and check for debris. Then when I reassemble, I torque and loosen the barrel nut a few times to help assure that all is seated correct. If I still have problems then something is out of spec.

 

Guess I'll find out in a week

FargoZ71 Enthusiast

FargoZ71

Posted
Posted

Ar15.com is much friendlier. Debris, grease, tq, re tq, ect.. last ditch effort.. check the chamber to make sure its straight with the barrel...

Squirrely Enthusiast

Squirrely

Posted
  • Author
Posted

I'll probable tear this down this weekend. What a bummer too, I had it all done up nice, lock tight, etc. But if it doesn't shoot straight then it's no good.

 

I found some info on the AR15 site. Looks like I made a rookie mistake.

  • 2 weeks later...
hollis092 Enthusiast

hollis092

Posted
Posted

I build AR's and perform service and upgrades. Let me know if you need some help - PM me.

 

What was your mistake?

 

When you installed the barrel, was the barrel tit and the groove in the upper aligned? Torque your barrel down enough?


I don't ever use locktite - general rule of thumb - things always need to be taken apart for some reason.

  • 2 weeks later...
  • 3 weeks later...
Squirrely Enthusiast

Squirrely

Posted
  • Author
Posted

All right.

 

Tore it down today and took serious time to reassemble. There were a couple things I noticed that I missed last time. These may seem like common sense but I just figured it out, or so I think

 

The barrel nut has indents in it for the set screw on the quad rail. Once I torqued the nut, loosened and re-torqued 5 or 6 times, I had to take great care in making sure these indents didn't twist the rail once installed with the set screw. Basically I had to thread the quad rail, install the set screw, and check if all was square. If it wasn't then I took the rail off and ever so slightly added a little more torque to the barrel nut until I got everything straight.

 

I think I had everything ever so slightly twisted, and when you add up the distance of the sight from center of the bore, that was probably enough to cant my sights.

 

Hopefully I got it this time.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,871
    Total Members
    8,960
    Most Online
    LonghornMM
    Newest Member
    LonghornMM
    Joined

  • Who's Online   4 Members, 0 Anonymous, 457 Guests (See full list)

  • Latest Articles

  • Posts

    • iso221
      Injector update

      By iso221 · Posted

      Because single shot injectors are ancient and multi hole injectors provide smoother running engines and sharper throttle response due to the fuel being atomized better..the best lead I have is a 24lb blue top injector almost everything matches up but the injector will put out about 26lb/hr which is just outside the gm threshold.figured id ask here to see if there was an absolute answer
    • CamGTP
      Injector update

      By CamGTP · Posted

      Why is my question?   Any change in injectors requires a tune. Unless you are going back with the OEM part number or a newer part number of that same injector.   Any size difference or type difference like the EV6 style injectors all have different injector data for them. And there is no EV6 injector that matches the factory 25 lb/hr size that your truck comes with. I've been messing with these trucks and tuning them for a long time and what you trying to do doesn't exactly make sense to me.
    • James McArthur
      2023 2500hd 6.6 l8t gas lifter ticking with misfire

      By James McArthur · Posted

      My 6.6 gas lt8 had lifter noise with 28000 miles bought new 2026 and while driven to dealer it threw #1 rod bearing “HD my ass” good luck with yours i hope it don’t turn a rod bearing!
    • Grumpy Bear
      The Peckish Synapse

      By Grumpy Bear · Posted

      When a condition becomes a business model.    https://www.gm-trucks.com/gm-truck-suv-incentives-pricing-2026/   Zane posted this in "Latest Articles".    The honest bottom line   Truck buyers have spent three years assuming this is a temporary condition that will break once inventories normalize. GM just presented it to investors as a durable strategy, on a chart, as evidence of good management.   Inventory did normalize. GM is at 511,000 units and squarely inside its own 50 to 60 day target. The discounts still did not come back, because the low incentive number is the goal rather than a symptom of shortage.   Plan your purchase around that reality instead of waiting for it to change. Follow our ongoing GM News coverage for pricing and incentive changes as the next-generation trucks land.
    • Grumpy Bear
      Winter Returned

      By Grumpy Bear · Posted

      Thought it was raining this morning when we woke. Nope. Dew point was over 80 F and humidity 98%. Zero visibility distance. Everything was 'sweating'. I've seen rain come out of clouds but never out of Pepper or the tree trunks.    Wicked storms just missed us sliding off to the east but by blocks. Heat index about 110 F with air temp in the 90's.    This is  our third wave this month of multiple days of this type of weather. And yet the grass is going dormant and the ground is cracking this side of the street and water up the the hood opposite. Just weird stuff going on. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...