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Posted: 4/5/2006 6:20:44 AM EDT
I just received my DPMS 3-prong flash hider to install on my 16" lighweight barrel.

My first question is; how should it be timed? One prong at the 12 o' clock position, or two prongs at the 12 o'clock position?

Second, the damn thing has no wrench flats along the sides. How do I torque it onto the barrel without scratching the piss out of it?

Any insight would be appreciated.

Link Posted: 4/5/2006 6:37:03 AM EDT
I think timing on 3-prong FH's is personal preference. Some people don't bother. Others like it to be symmetrical, with one prong or slot exactly up or down. Yet others like a prong to be in the 12 o'clock position so that any flash that escapes doesn't go into your line of sight.

As for torqueing it, there's a tool that has 3 holes for the prongs. It attaches to a 1/2" drive and fits onto the FH. It might still cause some finish damage.
Link Posted: 4/5/2006 6:38:48 AM EDT
No timing on the 3 prong. Should be installed with split washer.

There is a special wrench made to tighten them. You can use a barrel vise, a piece of leather and vice grips.
Link Posted: 4/5/2006 6:38:51 AM EDT
Thanks for the info.

Any idea where'd I get this 3 prong tool? I'm having trouble identifying it through my normal parts sources.
Link Posted: 4/5/2006 6:58:29 AM EDT

Originally Posted By glock24:
Thanks for the info.

Any idea where'd I get this 3 prong tool? I'm having trouble identifying it through my normal parts sources.



They are mil-surp items. A surplus store might have them. Used to see them all the time on Ebay before they banned AR parts sales. They go for about 10 bucks when you can find them.
Link Posted: 4/5/2006 7:38:19 AM EDT

Originally Posted By ar-wrench:

Originally Posted By glock24:
Thanks for the info.

Any idea where'd I get this 3 prong tool? I'm having trouble identifying it through my normal parts sources.



They are mil-surp items. A surplus store might have them. Used to see them all the time on Ebay before they banned AR parts sales. They go for about 10 bucks when you can find them.



Would the GI issue wrench work on 3-prong FH's? If so Bushmaster has them.

Link Posted: 4/5/2006 7:56:37 AM EDT
[Last Edit: 4/5/2006 8:03:14 AM EDT by desertmoon]
The 3 prong tool is a special tool...I'll try to find a pic.

Damn.....no luck.
Link Posted: 4/5/2006 7:59:36 AM EDT
If you would like to borrow one, i have a 3 prong wrench. But i'd like to hang on to it, so it's not for sale. but you're more than welcome to borrow it.
Link Posted: 4/5/2006 8:12:29 AM EDT

Originally Posted By NAM:
If you would like to borrow one, i have a 3 prong wrench. But i'd like to hang on to it, so it's not for sale. but you're more than welcome to borrow it.



Thank you for the generosity, but I just found one at Model 1 Sales. Their "G.I. barrel wrench" has a suspicious looking pattern on the face that I believe matchs up with the 3-prong flash hider. For $8 I can afford to risk it.

Model 1 Sales "GI Barrel Wrench"


Thanks again
Link Posted: 4/5/2006 8:16:22 AM EDT
The wrench will look like two triangles. Their pic does not appear to be the correct wrench.
Link Posted: 4/6/2006 3:06:34 PM EDT
You need this wrench:







Link Posted: 4/6/2006 5:58:03 PM EDT
Place the barrel in barrel vise jaws... do NOT use an action block for this operation.

Use an old butcher knife blade stuck in the prongs on the FH to tighten.

No "timing"... when it's tight, stop. You are done.
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