Ultralight Ultralight Rifles

[Trackselk]

How does the rear bolt attach?

I'm still pretty new to AR's, but the 2 screw holes for the detent ball arm/ gas key is where I bolted it strait onto. I'll try to post a pic when I'm home in a week. Very solid, pulls and pushes strait in line with the bcg

 

[Trackselk]

I forgot to mention that the aluminum spacer also keeps the bcg from rotating and avoiding full battery. I filed it to within 1 thou of the width of the solo detent arm. Without it it wouldn't go into full battery

 

[SoFLBeachBum]

I forgot to mention that the aluminum spacer also keeps the bcg from rotating and avoiding full battery. I filed it to within 1 thou of the width of the solo detent arm. Without it it wouldn't go into full battery

That’s well thought out, and that the bolt carrier rides smoothly is a plus. I read the earlier posts about issues with larger cartridges in the Solo, I wonder if your design solves that problem. And plus, it is super light and minimalist.

 

[Trackselk]

That’s well thought out, and that the bolt carrier rides smoothly is a plus. I read the earlier posts about issues with larger cartridges in the Solo, I wonder if your design solves that problem. And plus, it is super light and minimalist.

Thanks, I should know pretty soon as I test sticky undersized brass and NAS3 cases in the new ackley chamber as hot reloads. If I made the grip part of it a lot longer I could strike it with my palm to extract, I mean, it would still be a lot faster than a muzzleloader.
Edit: make that *oversize brass (for the ackley chamber/crush fit)

 

[schmidty3]

Found a neat trick.

Faxon barrel with integral flashhider machined in (they also have a brake option). 1# 5oz.

Obviously not ideal for can use. But saves some weight on a muzzle device and gives you a "14.5" barrel" without doing a pin and weld.

May not be ideal for "hunting". But Im putting together a car-15ish build. ~5#. But a2 sight and midlength gas. Truck gun. And maybe a meat packing gun in grizzly country. And a lot of fun/vibes in 3 gun type activities.

 

[yfarm]

Just let the the outside of the barrel rust. It won't harm it. In addition, every time a bit of rust is knocked off and replaced with new oxidation, the barrel gets measurably lighter. Win-win!

I use ospho as a rust converter/ primer before painting on steel. Has anyone every used it on a barrel as a surface finish?

 

[StupidLightweight]

View attachment 1073910View attachment 1073909
May not be ideal for "hunting". But Im putting together a car-15ish build. ~5#. But a2 sight and midlength gas. Truck gun. And maybe a meat packing gun in grizzly country. And a lot of fun/vibes in 3 gun type activities.

Share more pics when it’s finished! I love retro ultralight builds. You may consider a slick side A1 upper to keep it even more simplistic if you’re a righty.

 

[Luke S]

Here is a close up of my rail ground down.

I really like the finished version. The center of gravity is lower. Very easy to carry.

 

[StupidLightweight]

Clever grinding. I like it!

 

[ProRoad]

I have been working on this build for a few months and finally have the Lower ready to show. I was holding out for my upper to be complete but realize that the Lower might qualify as ULUL, but as a gasser, the upper will only be UL. The weights are from my scale and may vary from claimed weights.

With the issues of ordering the TN Arms lower this year, I decided to try the ROAM R-15 Magnesium Lower.

The build with the following parts, weighs out at 1 pound, 10 ounces. (More than one pound+ lighter than my two other builds!)

• Lower Receiver: ROAM R-15 Magnesium. 5.5oz $300 (with this high cost item, I decided to go a bit more budget and compromise weight vs cost on some of the following parts.
• 
  
• Stock: Mission First Tactical Battlelink Minimalist Stock. 5.7oz $20 Pawn Shop.
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• Trigger: Geissele SSA-E X 2-Stage Trigger w/Lightning Bow. 2.4oz $240-on sale!
• 
  
• Magazine release: V Seven Weapon Systems Ultra-Light, hard coat Anodized. .2oz $31.58
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• Mag release Button: Strike Industries aluminum FDE $12.99 (the V Seven systems button is actually lighter but I wanted FDE)
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• Bolt Catch: Battle Arms Dev. Enhanced, Investment Cast. .4oz $13.16
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• Trigger Guard: B5 Systems Polymer. .2oz $7.50
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• Grip Screw: Badger Ordnance Titanium. .1oz $10.99
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• End Plate: Fortis Mfg. QD 6061-T6 Aluminum .3oz $8.99
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• Castle Nut: Fortis Mfg. Aluminum. .2oz $12.89
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• Safety: Strike Industries Flip Switch FDE .4oz $29.99 (this also comes with a cool round button to make it single sided but the weight is the same on my scale)
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• Grip: Hogue 15 Degree Polymer. .4oz weighed $16.96
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• Pivot and Takedown Pins: Strike Industries Ultra Light, Aircraft Aluminum. .2oz weighed $16.00
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• Buffer Tube Kit: Geissele, Premium Mil Spec Buffer Tube assembly w Super 42 spring and H2 buffer $110.99
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• -Buffer tube weight 3.7oz
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• -Super 42 spring 1.6oz
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• -buffer 3.2 oz w weight removed (not yet sure what the 6 ARC will need)

--I wanted to use my go-to Radian Talon safety but apparently it does not play nice with the SSA-E X trigger: Radian Talon-GI Single sided. .4oz $41.95 NOT COMPATIBLE W Geissele SSA-E X TRIGGER (wtf)​

---So that's the Lower as it stands. Of course it could be lighter with a carbon fiber stock but that cost saving allowed me to go ahead and purchase the following for the upper.

• Bear Creek Arsenal side charging upper receiver in 6 ARC. $163
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• Barrel: Faxon Gunner Profile 6mm ARC- 16" 1.57 pounds or 25.13oz $159.99
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• Hand Guard: Odin Works Rune Free Float M-LOK 12.4" 8.7oz w Nut. $99.20
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• Gas Tube: Spike's Tactical Melonited Mid-Length .73oz $12.96
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• Gas Block: Faxon.750 1.12oz $22.99

More to come!
Cheers,
Brian