silencer for M1A?

paltik1 · Post by **paltik1** » Thu Jul 06, 2006 10:00 pm

everybody is aware that M1A or M14 has a threaded barrel for flashhider....did anyone already tried installing a silncer to it? any feedbacks? pros/cons? .......is it more quiet if i turn-off its gas system switch?

DINK · Post by **DINK** » Fri Jul 07, 2006 6:46 am

I've been using an AWC M30 can for years with my M1A. It's large and heavy by today's standards, but still works well. I usually run it with the gas port shut off as you get a lot of gas blowback otherwise and it's no fun.

Other than that, it works fine.

ElDuderino · Post by **ElDuderino** » Fri Jul 07, 2006 10:17 am

I believe the AWC Spectrum 2000 is made specifically for the M1A

Post by **silencertalk** » Fri Jul 07, 2006 10:22 am

It would be nice if AAC made an M14 flash hider for the 762-SD. No one seems to be asking for it though. I would use it.

The M14 has very fine and short threads, and a small diameter. It is really not a good thread setup for a can.

I had the Fisher can on my M14, and it was not hearing safe, but I think another can would be.

Post by **silencertalk** » Fri Jul 07, 2006 10:28 am

Will someone le me know who makes, or can someone make for me, a muzzle thread adaptor which will go onto the M14 muzzle threads and allow a 5/8-24 flash hider to fit?

It would be to attach a sound suppressor, so it needs to shoulder properly on the M14 barrel crown so as to preserve careful square alignment, and also must be concentric.

I have the M14 thread blueprint.

Post by **silencertalk** » Fri Jul 07, 2006 11:42 am

I am thinking I can take a Smith Vortex for the M14 and turn the front off it and then thread it 5/8-24 and get a nice adaptor with less hassle than making the internal M14 threads myself.

JEJ · Post by **JEJ** » Fri Jul 07, 2006 11:58 am

Have you tried Mark McWilliams at http://www.trosusa.com/ yet?

Post by **silencertalk** » Fri Jul 07, 2006 12:01 pm

Yes he said he won't do an M14 adaptor.

JEJ · Post by **JEJ** » Fri Jul 07, 2006 12:13 pm

rsilvers wrote:Yes he said he won't do an M14 adaptor.

OK that sucks.

What did the boys in Norcross say when you talked to them?

I am guessing that no-one trusts the original threads with the tighter tolerances of the better cans. If I were you, (assuming this is the standard barreled M1A/M14,) I would rebarrel the gun with a NM or heavier contour barrel. Then thread it 5/8-24.

Post by **silencertalk** » Fri Jul 07, 2006 12:53 pm

AAC feels they get very few calls about M14 silencers. I say it is a chicken and egg problem. If they make them, people will call.

JEJ · Post by **JEJ** » Fri Jul 07, 2006 1:25 pm

rsilvers wrote:AAC feels they get very few calls about M14 silencers. I say it is a chicken and egg problem. If they make them, people will call.

OK with the SF guys fielding them, you telling me that it would not be worth the effort to make some QD flash hiders for them.

Post by **silencertalk** » Fri Jul 07, 2006 2:18 pm

I wish they would make a run of 50 and see what happens.

Duke · Post by **Duke** » Sat Jul 08, 2006 12:28 pm

What is the thread pitch for the M1A?

Post by **silencertalk** » Sat Jul 08, 2006 1:59 pm

It is some bizzaro pitch combined with several specific lengths. It was just make for the castle nut, after all. Not to hold anything real.

Duke · Post by **Duke** » Sat Jul 08, 2006 2:37 pm

I cannot imagine that the threads are smaller than 9/16x?tpi
I would be interested in seeing the blueprints if you don't mind.
If the threads are really that big of problem to make, one could always just cut them off and rethread the barrel. You would only loose 1/2in of barrel. Could probably find another castle nut with new thread pattern and still use the original flashhider/front sight.

Post by **silencertalk** » Sat Jul 08, 2006 4:32 pm

Yes, they are smaller than 9/16.

They are .595"-32NS 3A
Major Diameter 0.5950"--0.0060"
Minor Diameter 0.5567" Max

It looks like the threads start 0.125" + 0.30" back from the muzzle (the muzzle itself is *not* threaded), and run back 0.29" + 0.30".

HandyMan · Post by **HandyMan** » Sat Jul 08, 2006 4:51 pm

Um, Robert, I hate to tell you this. But, .595" is larger than 9/16"(.5625")

Why can't you make a thread adaptor? The specs for the M1A do not look too demanding.

Duke · Post by **Duke** » Sat Jul 08, 2006 4:54 pm

9/16 is .5625.
.595 is an odd duck, 19/32 is .5938.
Is this a taper thread?

Edited cause I can't type.

Post by **silencertalk** » Sat Jul 08, 2006 5:26 pm

Oh ok, yes, it is larger than 9/16. I am not good with small internal threads. I mean, I could do it. It would take me 3 hours.

HandyMan · Post by **HandyMan** » Sat Jul 08, 2006 6:49 pm

Well, small internal threads can be a challenge. My main tool for internal threading has a minimum bore of .750". Sometimes I use a smaller tap with the correct pitch to make sub-1" threads. I use one side as a multi tooth threading tool. Works very well most of the time. Sometimes I forget what I am doing and crash however. If all else fails, I will grind a tool from a HSS blank. This is time consuming, and not the most fun I have ever had.

If you do decide to make a thread adaptor, use your thread mikes to make a male thread gage to whatever specs you need. Then, use that to gage your internal threads. Practice makes perfect.

Post by **silencertalk** » Sat Jul 08, 2006 7:53 pm

I am going to turn the prongs off a Smith M14 Vortex, and thread it to 5/8-24 on the outside, and then fit it to a 5/8-24 AAC flash hider. When it is done, I will Rockset them together.

HandyMan · Post by **HandyMan** » Sat Jul 08, 2006 9:29 pm

How long is the M1A flash suppressor? I ask because the minor diameter of the 5/8-24 threads will be too small to sit directly over the .595-32 threads of the barrel. You will probably have to have the 5/8-24 threads further foward on the flash suppressor.

Post by **silencertalk** » Sat Jul 08, 2006 9:31 pm

I am half done with my adaptor. It will work.

HandyMan · Post by **HandyMan** » Sat Jul 08, 2006 9:46 pm

Cool. Post a picture of it when your done.

Post by **silencertalk** » Sun Jul 09, 2006 12:58 am

Believe it or not, it took me about four hours. Better to buy stuff than make it.