Posted: 6/11/2022 1:41:20 PM EDT
[Last Edit: HighpowerRifleBrony][Edited]
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Originally "Anyone got a photo of a lightened DCM tube?" Arfcom archives and elsewhere haven't been kind to my searching. I've got a plot for six 0.75" holes and one 1" hole spaced 0.5" apart per side, but my memory recalls bigger holes. Currently a BCM M4 receiver, FN A4 barrel, Rock River Arms DCM barrel nut and tube weighs 4.3lbs on the old grocery scale. So add a pound for BCG and sights to make an assembled upper. |
"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
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Yep yep. Attached File |
"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
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I got a line to borrow a vertical mill tomorrow. According to the old grocery scales, the tube itself weighs 1.2lbs. The handguards weigh 0.4lb. The barrel nut assembly is probably another 0.3lb. Altogether about 2 pounds. I expect about 5oz shaved off. |
"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
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Is the whole idea to get under the weight for a Modern Military rig? I don't own one but have borrowed rigs to shoot that CMP game. ETA: http://bulletin.accurateshooter.com/2021/01/sunday-gunday-7-5-lb-ar-for-cmps-modern-military-discipline/ |
| No. Just floating an A4 upper. Don't wanna spend another $200 on QRF12 yet, but 2lbs is ridiculous for a featureless handguard. |
"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
 Lightening DCM Tube Sketching out the side holes. Attached File Roughly indexing centers for the 5/16" vent holes. Attached File Attached File Expanding the pilot holes in the sides to 3/4". I wanted 7/8", but the next size bit he had was 1" which was too much. Attached File Blue, orange/gold, and silver colored chips. Attached File 15oz tube. The gas tube slot wasn't milled quite far enough for standard tubes. Meh. I was being conservative. Attached File Attached File I think I'll do 4 flats and a dimple eventually. Attached File Attached File 8.5lbs. Still front heavy, dammit. About the same as the carbine with light, BUIS, and TR24.  Attached File |
"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
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I broke the upper in yesterday. Weather: 90-100*F, sunny with a some cloud patches over 2nd relay, occasional 5 mph gusts. It sucked, but wasn't unbearable. I did just about everything to sabotage my mental game in the morning, but still pulled out a win amongst a majority field of M1, M1A, and M1 Carbines. Load: 25gr IMR 3031/Hornady 55gr FMJ/2.255". Standing: 77/100 The sighters beforehand weren't close to call. I had decent sight pictures and trigger presses, but they just didn't go in the middle. I worried there might be ammo/fresh throat dissonance and considered DNFing. I wasn't feeling good anyway. For the last 3 shots, I switched to Offhand and snapped them out. They were a typical 4 MOA left, but elevation was good and about 10-ring size. I used stock notch #5 of 6 for A2 length. Sitting "Rapid": 93/100 My pants were too tight. Couldn't get my elbows on the front side of my knees. Wobble was a 9-ring CCW circle; I sent them at 12:00 when the post touched the bottom of bull. I recall the group being decently round at 11:00. Two notches longer than Prone with an M1907 sling still works well, but I might've been better off with 3 this day. Prone "Rapid": 89/100-2x Prep time was looking and feeling good until the end when my right hip/lower back started to cramp. So I rotated my position CCW about my waist and straightened my legs, more Euro style. 5 shots in the middle, 5 shots out left. Considering I tried 5+5 mags for the first time in more than a decade, I think I might have failed to place the stock or right elbow in the same spot. Prone Slow: 188/200-4x I had some difficulty with stock and elbow placement, but mostly fought sliding glasses. It was heckin' hot. No spotting scope - just sent 'em. Attached File Aggregate: 447/500-6x. |
"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
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A week had gone by and I felt guilty about not paying homage to the barrel gods with an abbreviated proper break-in. I lightly scrubbed the bore with Hoppe's #9 and JB paste. The only green I saw was in the crown and flash hider. Maybe moly just masks it well. I wanna get the borescope in just to see how little 65rds did. |
"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
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Originally Posted By backbencher: Nice shooting. Why not any number of free float rails? The barrel, receiver, and bolt are new, but have sat since autumn. I had the urge to tinker and break-in the barrel, so I pulled the DCM tube out of the parts bin for shakedown. Save money til a plan is more set. |
"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
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Originally Posted By Sinister: How much does it make weight by? You have room for tungsten weights in the pistol grip hole. |
"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
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I think it's this one from Missouri Tactical off amazon. I have two different types (one I got off Commercial Row -- I don't know who made it). Yes, there's plenty of room for a spare bolt.  This is the improved Ergo from Midway:  Originally Posted By HighpowerRifleBrony: I kinda wanna switch to an A2 upper receiver. Kinda wanna buy another QRF12, a Meopta 3-18x, and 1913 adapter for my VersaPod to make something SDMish. The barrel, receiver, and bolt are new, but have sat since autumn. I had the urge to tinker and break-in the barrel, so I pulled the DCM tube out of the parts bin for shakedown. Save money til a plan is more set. |
| I have always had the plugs fall off and I lose my storage stuff. always, even the magpul version. |
Don't be so open-minded that your brains fall out.
General education should not be mere job training, but training in how to be fully human.
https://www.memoriapress.com/articles/the-four-causes-of-classical-education/
General education should not be mere job training, but training in how to be fully human.
https://www.memoriapress.com/articles/the-four-causes-of-classical-education/
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Attached File |
Now, I'm gonna put the kibosh on you. You know I've kiboshed before, and I will kibosh again.
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Originally Posted By ICU: https://www.ar15.com/media/mediaFiles/16226/IMG_2881_PNG-2540682.JPG |
"Technique isn't something that can be taught. It's something you find on your own." - Bunta Fujiwara
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Originally Posted By HighpowerRifleBrony: You gonna paint over the bare metal? What size and spacing did you use? Yeah, I have to get something on that bare metal. Holes .75 & .2 spacing... Removed approx 4oz. |
Now, I'm gonna put the kibosh on you. You know I've kiboshed before, and I will kibosh again.