Dueling 12.5's - build planning, ersatz-GL/SSC vs GAU-5 ASDW

[Disciple]

Off the top of my head I don't know added weight, lemme rustle up some tools and get back to ya. Could be a bit.

LOL, no please don't pull it all apart just to weight it. But thanks if that's what you meant.

The DI pistol tube is interesting but 6061 concerns me a little. Maybe not a problem on a pistol. I could see the QD socket stripping out with hard use though.

[Diamondback]

With any luck the DI tube won't be needed for long, it only needs to last long enough for Asshat Terrorist Fascists to get bent over and bitchraped in the courtroom.

I WAS gonna say separating barrel, QRB and upper should be easy since I only hand-tightened the barrel nut... then I remembered the QRB star-nut (shorter barrel-nut) requires a barrel nut wrench and mine's in the storage unit two hours away. If I had all my tools over here it'd be five minutes tops combined dis- and re-assembly.

[Disciple]

I have to ask for your indulgence after all: please do weigh the system when you have time & tools. I have looked high and low and I cannot find any measurement of the weight the QRB adds. I almost cannot believe that none of the reviews and promotions mention this; do they make you sign a NDA or something?

[Diamondback]

I have to ask for your indulgence after all: please do weigh the system when you have time & tools. I have looked high and low and I cannot find any measurement of the weight the QRB adds. I almost cannot believe that none of the reviews and promotions mention this; do they make you sign a NDA or something?

GAU assembled weighs 6.4lb empty, so just take a 12.5 wafflestock and subtract its weight from that.
https://www.tactical-life.com/firear...akedown-rifle/

[Disciple]

GAU assembled weighs 6.4lb empty, so just take a 12.5 wafflestock and subtract its weight from that.
https://www.tactical-life.com/firear...akedown-rifle/

Honestly not sure if you mean this tongue in cheek or not. Where do I find the weight of the same configuration, handguard, sights, etc., without the QRB?

By the way I found a 7075-T6 pistol tube with QD at the end: https://www.strikeindustries.com/si-...pre-slick.html

[Diamondback]

Honestly not sure if you mean this tongue in cheek or not. Where do I find the weight of the same configuration, handguard, sights, etc., without the QRB?

By the way I found a 7075-T6 pistol tube with QD at the end: https://www.strikeindustries.com/si-...pre-slick.html

Do you have a 12.5" "standard" wafflestock build with MBUS sights? If so, take the handguard off and weigh the rest of it, I'll weigh the MI handguard and then we subtract that total from 6.4. Pretty much any Government-profile 12.5 should do as a stand-in, gas tubes and lo-pro blocks shouldn't differ that much. The MBUS sights weigh almost nothing. (Not being flip, trying to crutch you to an answer because of yet another case of my mother's self-inflicted injuries keeping me stuck closer to home until whatever she pulled or twisted is back to normal. I swear she does this shit on purpose, because it happens like clockwork whenever I start making headway on things...)

As loath as I am to do "tacticool" like SI, that might be worth a look if the DI doesn't hold up or the courts don't go our way. If they do, however, back to CAR tube and SBA3/SBA4...

[Disciple]

Do you have a 12.5" "standard" wafflestock build with MBUS sights?

No, I have nothing like that unfortunately. I see where you were going with that now however. If you would weigh your upper receiver with that half of the QRB, and the barrel assembly without the handguard, I'll go through the AR Parts Weight spreadsheet and add up the rest of the components to find the difference.

[Diamondback]

Will do, but the barrel weight is going to be "contaminated" by both the QRB frontplate and the MI mount nut, both locked in by the gas block. (Sorry, it was enough nightmare getting that damn thing on the first time, I paid the extra for drilling and pinning and got "drill but no pin." Fighting with gas blocks... I think that stays on the "Subcontract to Pro" list.)

The complete CRLW-10.5 with nut I used weighs 7.6oz. Barrel is 22oz.

[Disciple]

Thank you, that will do fine.

[Diamondback]

With barrel nut, frontplate and flash hider the barrel weighs 35.16oz. 35.16 - 22 = 13.16oz combined weight of A2 FH/crush washer, MI nut and QRB frontend.

BCG and CH removed but MBUS3 still on, the backplate and upper assembly weigh 12.13oz.


Test-fitting an idea I just had... thinking about dumping the weight and inflexibility of the A3 Tactical rail-to-rail clamp by just asking my pro smith if he can directly braze the ends of two QD optic-risers together for a closer coupling between the halves for both this and the "Bond Movie Briefcase."