Mock dissipator project

[Mossy Man]

Ok, so I have an extra PSA upper laying around, its pne of the premium carbine length FN barreled.....

Im going to try converting it to take rifle length handgiards.

Gonna pop off the FSB, replace with a lopro, and d&t the FSB for set screes.

Anyone done this? Will be using a magpul moe guard. I understand this accepts round caps as well as triangle?

What size screw should I use to to secure the end plate to the fsb via the gas port?

[TheExiled]

Ok, so I have an extra PSA upper laying around, its pne of the premium carbine length FN barreled.....

Im going to try converting it to take rifle length handgiards.

Gonna pop off the FSB, replace with a lopro, and d&t the FSB for set screes.

Anyone done this? Will be using a magpul moe guard. I understand this accepts round caps as well as triangle?

What size screw should I use to to secure the end plate to the fsb via the gas port?

Good question, I have been contemplating a mock dissy myself, but will be using a FF foreend.

[Mossy Man]

Yeah, normally the gas tube holds it in...but i guess ill just try a bunch.

[fmunk]

Whatever size screw that is close to (or slightly larger for threads to bite) diameter of gas tube. I just used a spare old gas tube. MOE handguard is compatible with both round and triangular. I have a like new rifle length set in black for sale in original packaging.

[FX-05 Xiuhcoatl]

This is my dizzy, riflegear bolt on gas block http://www.riflegear.com/p-927-armal...-w-screws.aspx no need to drill and tap your barrel.

[Mossy Man]

^ wanted that, but out of stock.

Armalite is the only mfg, and thry are backlogged months.

Also, not D&T barrel, just FSB. Gonna use set screws to hold it.

[fmunk]

BCM FN barrel? I built mine with a BCM barreled upper. Instead of the A2 front sight I used a YHM block/folding sight. The A2 and tappered pins are free if you buy the MOE handguard.

[Oldmandan]

Anyone done this? Will be using a magpul moe guard. I understand this accepts round caps as well as triangle?

Correct the Magpul handguard accepts either one.

[Mossy Man]

BCM FN barrel? I built mine with a BCM barreled upper. Instead of the A2 front sight I used a YHM block/folding sight. The A2 and tappered pins are free if you buy the MOE handguard.

i already have a magpul handguard and low-pro gas block coming; just need to D&T the old FSB with the appropriate screws.

some guys are saying they didn't need to screw in the endcap to the FSB; the tension of the hg on the d-ring and endcap was enough.

[ky2970]

On my dissy I didn't put anything through the plate to the FSB and it's locked on there tight. I run it hard once a month and have yet had any issues. Try it without and see how it goes.

[jpm804]

i already have a magpul handguard and low-pro gas block coming; just need to D&T the old FSB with the appropriate screws.

some guys are saying they didn't need to screw in the endcap to the FSB; the tension of the hg on the d-ring and endcap was enough.

The mock dissy I got from PSA had the screw in the endcap to the fsb.

Installed moe hanguard and it fit without removing the screw...unfortunately my kac m5 ras handguard would not fit with out me reoving the screw.... Removed the screw and the m5 ras still held in place tightly.

[Whiterabbit]

Hello dissipator builders, I have a question:

Any of you guys run A2 handguards with a low profile gas block? How about A1? Are they the same inside after you pull the heat shields out?

Di you think it is possible to run A1 (or A2) handguards with a low pro gas block? Even if some of the guard has to be carved out? Possible? If so, what has to be done to make that happen? .75" ok? does it have to be .625? Are there adjustable products out there that fit the bill here?

[ky2970]

Running drop in handguards shouldn't interfere with the lopro gas block. And the measurement depends on your barrel.

[Whiterabbit]

Running drop in handguards shouldn't interfere with the lopro gas block. And the measurement depends on your barrel.

I'm talking specifically about A2 and A1 handguards. You did not specify like I did. Were you thinking about free float tubes, or were you thinking very specifically about A1 and A2 hand guards?

I mentioned diameter simply because I assume that a .936 (or whatever the bull size) gas block with a bull barrel would be really stretching things to fit an A1 or A2 handguard. In fact, im not even sure they make the cap in the required diameter for that. But the assumption is that as the barrel gets smaller, less gas block is needed to get the same function. (aka: qualitatively a .625 gas block might have smaller outer dimensions than a .936 gas block) Theoretically. But yes, I do understand that .75 and .625 refer to the inside diameter of any gas block, and has no actual quantitative relationship to the outer dimensions of the gas block, which are the critical dimensions for fitment under handguards.

[THEJAPINO]

Is your barrel .750" out front where you want to put the FSB? If not, you might have to turn it down and fit a .625" FSB.