Ultralight Ultralight Rifles

Took the Howa mini 6 dasher for another range session and needed a gun to shoot in the in between, so I brought the ugly rifle.

PA micro prism 5x - 77TMK LC brass cci41 primers LVR powder, 2.375” COAL.

In order, 25g, 25.5gr, 26gr, 26.3gr.

Didn’t chrono. But it’s ridiculous this gun can do this with this optic, and a 65.00 barrel (BCA pencil)

IMG_7310.pngIMG_7311.pngIMG_7312.pngIMG_7313.png


Shocker, I think I’ll load up 100 26.3gr!
 
KyleR1985 said:
Took the Howa mini 6 dasher for another range session and needed a gun to shoot in the in between, so I brought the ugly rifle.

PA micro prism 5x - 77TMK LC brass cci41 primers LVR powder, 2.375” COAL.

In order, 25g, 25.5gr, 26gr, 26.3gr.

Didn’t chrono. But it’s ridiculous this gun can do this with this optic, and a 65.00 barrel (BCA pencil)

View attachment 875006View attachment 875007View attachment 875008View attachment 875009


Shocker, I think I’ll load up 100 26.3gr!
Click to expand...
Damn, nice job!

I need to try your 26.3 LVR load. I can get the 73ELDM to shoot like that pretty easily, but haven't found anything as consistent with the 77TMK.

Every time I think about building some other rifle, then look at what these can do, I ask myself "Why?". I honestly can't come up with a practical reason.
 
Thegman said:
Damn, nice job!

I need to try your 26.3 LVR load. I can get the 73ELDM to shoot like that pretty easily, but haven't found anything as consistent with the 77TMK.

Every time I think about building some other rifle, then look at what these can do, I ask myself "Why?". I honestly can't come up with a practical reason.
Click to expand...

I think my BCA barrel is something like 2.45” to touching the lands with the TMK so I’m somewhere around .07-.075 off.

65* at range today 100% humidity
 
KyleR1985 said:
I think my BCA barrel is something like 2.45” to touching the lands with the TMK so I’m somewhere around .07-.075 off.

65* at range today 100% humidity
Click to expand...

Confirmed 1.945” CBTO, 2.375” coal, .080 off lands.

I suck at knowing when I at at the lands or in the lands or whatever. But it should get ya close.
 
Also went out on a limb and bought a 6x45 reamer. If anyone wants to rent it shoot me a PM. We have a couple barrels to do in the next few weeks, but it will be sitting after that. Hoping one of these is for the ULUL…
 
Converted one of my ultralight gassers over to gas-less. Rifle weight right around 3.5lbs
Modified slick slide upper and KAK 7075 bcg with custom charge handle (11.2oz)
Custom captured spring setup to hold bolt closed. 1.3oz
Milspec lower with custom machining: larue mbt-2s trigger and standard milspec lpk
Custom barrel nut and 10” carbon handguard (3.2oz total)
Shaw portless barrel.
Custom carbon stock using Ace ultralight tube. Looks like an A1 tube but carbine length. Butt pad is 3D printed foam with nice grip and a little cushion. I wanted something that was comfortable and has good cheek weld. I figure if I am building it, I want it to look nice and function well. My handguard is a little longer and a little larger. As an engineer I cringe at 1.350” diameter aluminum barrel nuts. Especially the cheap ones. This one is machined from 7075. Outer diameter of the carbon tube is 1.575” which is closer to standard ar handguards. I have few things planned to drop a few ounces but pretty happy with it. I did not want to run any plastic lowers or anything like that. I may change the grip out to something larger like my B5 P-22 at a .5oz gain but a 3D printed trigger spacer is working for now. Using a Sightron Big Sky 3.5-10x42 for load development so far but may give a 5x prism a try. Best 5 shot group so far was right around 1moa. Only ran about 25 through it so far so should tighten up. Sitting at 4.8lbs with stainless mag and all as is now. Prism and a few other mods I have in mind would put it right around 4lbs. Not bad for all metal receivers and full length bcg and spring setup. I have a new spring design that fits inside the upper receiver only that I will machine up and test soon.

APC_0056.jpeg
APC_0058.jpeg
APC_0059.jpeg
APC_0062.jpeg
APC_0068.jpeg
 
Jesseb said:
Converted one of my ultralight gassers over to gas-less. Rifle weight right around 3.5lbs
Modified slick slide upper and KAK 7075 bcg with custom charge handle (11.2oz)
Custom captured spring setup to hold bolt closed. 1.3oz
Milspec lower with custom machining: larue mbt-2s trigger and standard milspec lpk
Custom barrel nut and 10” carbon handguard (3.2oz total)
Shaw portless barrel.
Custom carbon stock using Ace ultralight tube. Looks like an A1 tube but carbine length. Butt pad is 3D printed foam with nice grip and a little cushion. I wanted something that was comfortable and has good cheek weld. I figure if I am building it, I want it to look nice and function well. My handguard is a little longer and a little larger. As an engineer I cringe at 1.350” diameter aluminum barrel nuts. Especially the cheap ones. This one is machined from 7075. Outer diameter of the carbon tube is 1.575” which is closer to standard ar handguards. I have few things planned to drop a few ounces but pretty happy with it. I did not want to run any plastic lowers or anything like that. I may change the grip out to something larger like my B5 P-22 at a .5oz gain but a 3D printed trigger spacer is working for now. Using a Sightron Big Sky 3.5-10x42 for load development so far but may give a 5x prism a try. Best 5 shot group so far was right around 1moa. Only ran about 25 through it so far so should tighten up. Sitting at 4.8lbs with stainless mag and all as is now. Prism and a few other mods I have in mind would put it right around 4lbs. Not bad for all metal receivers and full length bcg and spring setup. I have a new spring design that fits inside the upper receiver only that I will machine up and test soon.

View attachment 876796
View attachment 876797
View attachment 876798
View attachment 876801
View attachment 876805
Click to expand...
Really like the Stock!
 
Jesseb said:
Converted one of my ultralight gassers over to gas-less. Rifle weight right around 3.5lbs
Modified slick slide upper and KAK 7075 bcg with custom charge handle (11.2oz)
Custom captured spring setup to hold bolt closed. 1.3oz
Milspec lower with custom machining: larue mbt-2s trigger and standard milspec lpk
Custom barrel nut and 10” carbon handguard (3.2oz total)
Shaw portless barrel.
Custom carbon stock using Ace ultralight tube. Looks like an A1 tube but carbine length. Butt pad is 3D printed foam with nice grip and a little cushion. I wanted something that was comfortable and has good cheek weld. I figure if I am building it, I want it to look nice and function well. My handguard is a little longer and a little larger. As an engineer I cringe at 1.350” diameter aluminum barrel nuts. Especially the cheap ones. This one is machined from 7075. Outer diameter of the carbon tube is 1.575” which is closer to standard ar handguards. I have few things planned to drop a few ounces but pretty happy with it. I did not want to run any plastic lowers or anything like that. I may change the grip out to something larger like my B5 P-22 at a .5oz gain but a 3D printed trigger spacer is working for now. Using a Sightron Big Sky 3.5-10x42 for load development so far but may give a 5x prism a try. Best 5 shot group so far was right around 1moa. Only ran about 25 through it so far so should tighten up. Sitting at 4.8lbs with stainless mag and all as is now. Prism and a few other mods I have in mind would put it right around 4lbs. Not bad for all metal receivers and full length bcg and spring setup. I have a new spring design that fits inside the upper receiver only that I will machine up and test soon.

View attachment 876796
View attachment 876797
View attachment 876798
View attachment 876801
View attachment 876805
Click to expand...
Fantastic job on that! You just put together several ideas that formerly were just bouncing around here.

Does your spring currently sit in the stock behind the bolt carrier?

If you get bored and want to make an extra copy of version II bolt carrier and spring, let me know!
 
Jesseb said:
Converted one of my ultralight gassers over to gas-less. Rifle weight right around 3.5lbs
Modified slick slide upper and KAK 7075 bcg with custom charge handle (11.2oz)
Custom captured spring setup to hold bolt closed. 1.3oz
Milspec lower with custom machining: larue mbt-2s trigger and standard milspec lpk
Custom barrel nut and 10” carbon handguard (3.2oz total)
Shaw portless barrel.
Custom carbon stock using Ace ultralight tube. Looks like an A1 tube but carbine length. Butt pad is 3D printed foam with nice grip and a little cushion. I wanted something that was comfortable and has good cheek weld. I figure if I am building it, I want it to look nice and function well. My handguard is a little longer and a little larger. As an engineer I cringe at 1.350” diameter aluminum barrel nuts. Especially the cheap ones. This one is machined from 7075. Outer diameter of the carbon tube is 1.575” which is closer to standard ar handguards. I have few things planned to drop a few ounces but pretty happy with it. I did not want to run any plastic lowers or anything like that. I may change the grip out to something larger like my B5 P-22 at a .5oz gain but a 3D printed trigger spacer is working for now. Using a Sightron Big Sky 3.5-10x42 for load development so far but may give a 5x prism a try. Best 5 shot group so far was right around 1moa. Only ran about 25 through it so far so should tighten up. Sitting at 4.8lbs with stainless mag and all as is now. Prism and a few other mods I have in mind would put it right around 4lbs. Not bad for all metal receivers and full length bcg and spring setup. I have a new spring design that fits inside the upper receiver only that I will machine up and test soon.

View attachment 876796
View attachment 876797
View attachment 876798
View attachment 876801
View attachment 876805
Click to expand...
What’s the weight of your bcg and spring compared to the law tactical Aric (9.8oz)?
 
Current setup is 6.5oz for bcg and captured spring setup. I have further bcg lightening modeled up but wanted to run it as is for a bit first. The captured spring setup goes in the receiver tube like standard ar setup. The new design would be a gas key replacement and piece that goes in place of the charge handle on standard upper. Would be about the same weight but would allow you to cut the back half of the bcg completely off saving an ounce or so. Thinking 5-5.5oz all in should be possible. Obviously this is for non gasser only. I didn’t like the idea of being able to knock the bolt open so easily. I backpack hunt with a kifaru gun bearer so between that and skeleton style stocks hanging up in the gun bearer drove my design decisions. I also have a lightweight spring behind the bolt so it actually wants to come open without a buffer spring setup. Cycles great and you can just let go to load next round. Captured spring has about 5lbs closed force and 11lbs at full open. New setup would look like this.

APC_0069.jpeg
 
Jesseb said:
Current setup is 6.5oz for bcg and captured spring setup. I have further bcg lightening modeled up but wanted to run it as is for a bit first. The captured spring setup goes in the receiver tube like standard ar setup. The new design would be a gas key replacement and piece that goes in place of the charge handle on standard upper. Would be about the same weight but would allow you to cut the back half of the bcg completely off saving an ounce or so. Thinking 5-5.5oz all in should be possible. Obviously this is for non gasser only. I didn’t like the idea of being able to knock the bolt open so easily. I backpack hunt with a kifaru gun bearer so between that and skeleton style stocks hanging up in the gun bearer drove my design decisions. I also have a lightweight spring behind the bolt so it actually wants to come open without a buffer spring setup. Cycles great and you can just let go to load next round. Captured spring has about 5lbs closed force and 11lbs at full open. New setup would look like this.

View attachment 876854
Click to expand...
This looks really good. I'd like to try that out. I've been running mine without the spring behind the bolt these days to help avoid some of that force trying to unlock the bolt when in battery. On a couple of bolts, I've put a #5 plumbing O-ring where the gas rings were to add some friction fitting between the bolt and the carrier, but that doesn't seem to be necessary. Seems to run fine without a spring either way. Maybe a little bit more force required to open the bolt, but not much.
 
doverpack12 said:
Did you drill and tap the KAK BCG?
Click to expand...
Yes. I slabbed the left side only so far and then drilled and tapped. Whipped up a quick aluminum charge handle that uses a standard steel socket head screw. It weighs 7 grams total. I have a Ti one modeled that would be around 4.5-5 grams. Problem with all of this stuff is every time I stop production work to tinker, I probably lose more money than I care to know.
 
Can anyone share with me where I can get a titanium adapter to put on my Shaw barrel to go from 1/2 x 28 to 5/8 x 24 so I can try my Rugged 360 ti
 
C Bow said:
Can anyone share with me where I can get a titanium adapter to put on my Shaw barrel to go from 1/2 x 28 to 5/8 x 24 so I can try my Rugged 360 ti
Click to expand...
Why titanium? Your talking maybe 2 or 3 grams and I'd guess increasing the likelihood of galling?
 
Jesseb said:
Yes. I slabbed the left side only so far and then drilled and tapped. Whipped up a quick aluminum charge handle that uses a standard steel socket head screw. It weighs 7 grams total. I have a Ti one modeled that would be around 4.5-5 grams. Problem with all of this stuff is every time I stop production work to tinker, I probably lose more money than I care to know.
Click to expand...

So you flattened the tap area then drilled/tapped?
 
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