Ultralight Ultralight Rifles

[JBradley500]

I had a spare .623" I.D. stainless sleeve so I thermal fit it on this BCA barrel. I didn't put a set screw in the gas port in this barrel like I did in my other ULUL, but I think that's overkill with the sleeve.

This will go on a future spare parts build, which will likely just end up being the same as the first rendition of my other ULUL.

 

[KyleR1985]

I had a spare .623" I.D. stainless sleeve so I thermal fit it on this BCA barrel. I didn't put a set screw in the gas port in this barrel like I did in my other ULUL, but I think that's overkill with the sleeve.

This will go on a future spare parts build, which will likely just end up being the same as the first rendition of my other ULUL.

View attachment 824774

Mins sharing basic process, and where we can find the sleeve?

 

[JBradley500]

Mins sharing basic process, and where we can find the sleeve?

Easier for me than most because my family has a business that has its own machine shop.

Basically if you can find a machinist, order a sleeve that is 0.75" OD x 0.623" ID x 1" long. Mine are made of 304 stainless. Heat it up until it just starts turning red and drop it on ASAP. It'll drop on and let it cool for a couple of minutes. It's basically a tight press fit once it's cools and contracts.

Tip - if you do this, order a few because you'll probably pay a lot more for setup time than you will for the material and run time.

 

[Luke S]

Will that kind of heat warp the barrel at all?

 

[Trackselk]

Will that kind of heat warp the barrel at all?

I seriously doubt it, large volume of barrel steel and even all the way around. But, I'm about to JB weld in a set screw in mine.

Threading the port is not something the inexperienced would want to try though, it was a very delicate operation. Or in other words, I wouldn't try this if you have tapped HARD steel before. It's a gritty, crunchy feeling operation, unlike any steel that I've ever tapped before. And, like someone previously said, use cutting oil.

 

[Jimbee]

4.5lbs with a magazine and scythe. I know there are a few places to lose weight, scope caps, dust cover, 1/2 to 5/8 muzzle thread adapter....

 

[Trackselk]

BCA pencil barrel, BCA upper/sidechargebcg, PA 5x micro prism update:


Shot 23.5gr, 24, 24.5 Varget at 2.385” with 77TMK.

Looking good! I'm going to shoot mine soon, and then bed it with the loctite, and see if that tightens up the groups

 

[KyleR1985]

4.5lbs with a magazine and scythe. I know there are a few places to lose weight, scope caps, dust cover, 1/2 to 5/8 muzzle thread adapter....View attachment 824854View attachment 824855View attachment 824856

Tell us about your stock!

 

[Jimbee]

Tell us about your stock!

Amazon CF tubes. I bought a cheap aluminum barrel nut off ebay and attached the cf tube with 3 screws and a thin layer off Devcon. The buttstock is a cf tube attached with 6 rivets to a cut off pistol buffer tube. I bought a small piece of cf plate, cut and super glued it on the end of the tube. I'm not sure if it will hold up or not. Time will tell.

 

[JBradley500]

Will that kind of heat warp the barrel at all?

Anything is possible but my Faxon pencil barrel I did it with hammers tiny groups.

 

[HighUintas]

Amazon CF tubes. I bought a cheap aluminum barrel nut off ebay and attached the cf tube with 3 screws and a thin layer off Devcon. The buttstock is a cf tube attached with 6 rivets to a cut off pistol buffer tube. I bought a small piece of cf plate, cut and super glued it on the end of the tube. I'm not sure if it will hold up or not. Time will tell.

Looks good. What's the weight of the stock?
The "pad" is kind of comical looking. Does it actually provide any recoil reduction?

I would bet that if the super glue doesn't hold, using some epoxy with a slight filet built up on each side would be super solid

 

[Jimbee]

Looks good. What's the weight of the stock?
The "pad" is kind of comical looking. Does it actually provide any recoil reduction?

I would bet that if the super glue doesn't hold, using some epoxy with a slight filet built up on each side would be super solid

I'm going to try the butt "pad" as is and see how I like it, maybe add some foam if needed. This is a work in progress.

 

[Bigwindymt]

Had anyone had any issues with the TNArms15 carbon lower? The weight savings is great but I could probably live with the extra 4oz if it has any repeated failure points.

Never had one break (ATI omni, new frontier, or TN arms).If you hunt where it gets cold, the polymer lowers don't suck the heat out of your hands either. I've been hunting with polymer lowers for nine years now; aluminum sucks to lug around in the cold.

 

[Thegman]

Looking good! I'm going to shoot mine soon, and then bed it with the loctite, and see if that tightens up the groups

It would be interesting to see what effect the bedding has on group size. Keep us posted.

 

[KyleR1985]

It would be interesting to see what effect the bedding has on group size. Keep us posted.

I’ve been thinking about this a lot.

I’m not sure it would tighten a group, as it’s my sense barrel isn’t moving shot to shot in a single shot string. It seems like it’s more useful for maintaining point of impact across time. Like, banging gun around in truck and woods and pack.

But, it could be moving in single shot string with heat, given the inherent tolerance of AR barrel system.


I can confirm that it will remove a lot of tolerance from the equation. To the point that my Shaw barrel is not coming out of the upper it is in, without a fight. And I ain’t fighting it. I want it that way. Haha if I sell that barrel whomever buys it is getting a free upper!

 

[Trackselk]

I’ve been thinking about this a lot.

I’m not sure it would tighten a group, as it’s my sense barrel isn’t moving shot to shot in a single shot string. It seems like it’s more useful for maintaining point of impact across time. Like, banging gun around in truck and woods and pack.

But, it could be moving in single shot string with heat, given the inherent tolerance of AR barrel system.


I can confirm that it will remove a lot of tolerance from the equation. To the point that my Shaw barrel is not coming out of the upper it is in, without a fight. And I ain’t fighting it. I want it that way. Haha if I sell that barrel whomever buys it is getting a free upper!

I'm thinking that since the enormous pressures actually flex barrels upon firing, that any gap in there is going to cause some exaggerated movement, in addition to extra heat stringing as well

 

[Thegman]

I’ve been thinking about this a lot.

I’m not sure it would tighten a group, as it’s my sense barrel isn’t moving shot to shot in a single shot string. It seems like it’s more useful for maintaining point of impact across time. Like, banging gun around in truck and woods and pack.

But, it could be moving in single shot string with heat, given the inherent tolerance of AR barrel system.


I can confirm that it will remove a lot of tolerance from the equation. To the point that my Shaw barrel is not coming out of the upper it is in, without a fight. And I ain’t fighting it. I want it that way. Haha if I sell that barrel whomever buys it is getting a free upper!

I'm not sure either. I apply grease pretty liberally between the sides of the barrel extension and receiver which takes up space, but probably doesn't lock things together and stop potential movement like the loktiite does.

 

[Trackselk]

Accurize Your AR-15 - Guns and Ammo

Guns & Ammo editor Joseph Von Benedikt takes a look at four steps to increase precision on your personal AR-15.

www.gunsandammo.com

Here's the article that got me ordering the loctite 620.

 

[StupidLightweight]

According to experts I've spoken with, the best way to rigidly attach the barrel to the upper receiver is a two part process. They use an oversized barrel extension and cool the entire barrel in the freezer. They then heat the upper receiver and quickly join the two. Once the barrel extension warms up and expands the receiver contracts, the two are rigid.

If you're a manufacturer, this is easy. What I do as a garage gunsmith is epoxy the barrel into the upper receiver. If you ever need to take it off, a torch on the upper receiver gets it hot enough to pop the barrel off.

 

[Trackselk]

According to experts I've spoken with, the best way to rigidly attach the barrel to the upper receiver is a two part process. They use an oversized barrel extension and cool the entire barrel in the freezer. They then heat the upper receiver and quickly join the two. Once the barrel extension warms up and expands the receiver contracts, the two are rigid.

If you're a manufacturer, this is easy. What I do as a garage gunsmith is epoxy the barrel into the upper receiver. If you ever need to take it off, a torch on the upper receiver gets it hot enough to pop the barrel off.

Makes me wonder if a Smith can easily replace a standard sloppy extension with an oversized one? They're just a press fit right?