Please help me find a muzzle device for an AR9 for my gal

[GOG]

I ordered a PSA 8" 9mm pistol for my honey and being unfamiliar with PCC's need some help finding a good muzzle device. So far I'm mostly finding linear compensators that apparently move the sound and flash forward but don't seem to improve recoil or muzzle rise. (AFAIK)
The thread is 1/2×28 and we won't be using a suppressor.

My goal is to mitigate recoil and muzzle rise rather than sound.

I know you gents know your stuff, so what would you suggest?

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[808hondacrguy]

I am a big fan of the VG6 Gamma. I had one on my old 7" pistol, and liked it so much, that now my 223 and 308 bolt guns both have them. Unfortunately my new FM9 has a 1/2x36 pitch, and VG6 don't not make one for that combo.

 

[Member 34319]

9mm in 7" barrel with factory ammo will not have enough gas pressure to make a brake effective to mitigate any sort of recoil. In a shorter barrel with high pressure reloads compensators would work.

Linear comps are not brakes, they do nothing for recoil. They are for perceived sound mitigation. It is still loud, but the harmonics of the cone shaped project the loudness forward. That's about it.

If you want to mitigate recoil in a straight blowback 9mm. You'll need to change buffer weights and springs around till you find something that allows the gun to function, yet reduces the shear force of the blowback action. The round itself firing does not create much recoil, it is the 10-20 ounces of metal flying forcefully rearward in the aluminum tube that creates the recoil in a blowback 9mm.

 

[GOG]

I hadn't thought about the buffer and springs.
The VG6 has been on my radar, so it's good to know I'm on the right track.

I don't think recoil will be a big problem, but muzzle rise is and the VG6 seems like a good way to go so far.

Thanks guys.

 

[msgriff]

I run a X-Caliber on a .358 Winchester and like it (same brake as a 9mm). Open up the top ports for more compensation and dill out the 3 or 9 o'clock port blank if you want to counteract a support arm concern. They are SS or matte SS. Muzzle Brakes and More is another source and will make a custom brake to your specs if wanted. SS or Ti only.

 

[2Wheels4Ever]

I hadn't thought about the buffer and springs.
The VG6 has been on my radar, so it's good to know I'm on the right track.

I don't think recoil will be a big problem, but muzzle rise is and the VG6 seems like a good way to go so far.

Thanks guys.

Report back to us on whatever route you go. I'm curious to know if Reno is right, and the brake won't do anything due to lack of gas pressure, or if there's enough to mitigate any muzzle flip.

 

[Member 34319]

I hadn't thought about the buffer and springs.
The VG6 has been on my radar, so it's good to know I'm on the right track.

I don't think recoil will be a big problem, but muzzle rise is and the VG6 seems like a good way to go so far.

Thanks guys.

Muzzle rise is caused by recoil. Not the round firing per say, but the transfer in the balance of the weapon from reciprocating parts. You can put a fake suppressor on the front to offset the imbalance. Or a heavy large muzzle device on the front of the barrel. That would help offset the bolt and buffer weight going rearward by having more weight forward.

 

[Knebel]

Odin works makes an excellent buffer thats adjustable with weights. I tuned my AR9 a bit with it and recoil reduced when I just went a little lighter on the weight. I think I went from almost 7oz to 5.8oz in complete buffer weight and it made a big difference! Gotta be careful to not get bolt bounce...

 

[Member 34319]

You can also work to prevent muzzle flip by proper shooting stance and working to hold the gun better.

Think of the stock and barrel as a level. The buffer is roughly the same weight as the barrel. The bolt is in the middle. Fairly balanced depending on barrel and buffer weights. You are gripping this level below via the grip. The grip becomes the fulcrum when the weight shifts in either direction. Firing a round throws the bolt and buffer all the way to the rear, the level pivots on the fulcrum (the grip) and the front end goes up. There should be some of the same thing happening when the spring returns the buffer and bolt forward and slams into the chamber.

Holding the gun well and ensuring the stock is placed firmly into the meat of your shoulder will greatly reduce any muzzle climb.

 

[GOG]

She has short arms. She jokes about having "T-Rex arms", so I'm trying to make it as easy as possible for her to shoot accurately.

You guys have given me some good information to think about. I think I'd prefer to start with a muzzle device and hopefully be able to leave the buffer and springs alone if possible.

I'm leaning towards the VG6, but I'll wait until more guys chime in.

 

[TTSX]

I have a vg6 on my Ruger PC Charger. Can't tell you if it does anything about recoil because it went on right out of the box, however it's pretty tame.

 

[oa98pistol512]

Their is very little recoil in a ar9 pistol or rifle shoot it first then decide if you need a high dollar device.

 

[Member 34319]

Their is very little recoil in a ar9 pistol or rifle shoot it first then decide if you need a high dollar device.

Not true. Most that have shot both a reg 223/556 AR and a 9mm blowback AR will always state the 9mm has more recoil. Which is true, considering the mechanics involved with the 9mm version. Is it a lot of recoil, no, is it noticeable over other AR15s, yes.

 

[titsonritz]

Their is very little recoil in a ar9 pistol or rifle shoot it first then decide if you need a high dollar device.

^^^This.

Get a standard A2...cheap, effective flash suppression, closed bottom provides compensation...
https://www.brownells.com/rifle-par...iders/ar-15-a2-flash-hider-9mm-prod97632.aspx

oops wrong thread pitch here you go...
https://hbindustries.net/store/shop/9mm-a2-flash-hider/
https://aerospacearms.com/faxon-firearms-9mm-a2-flash-hider-1-2x28/

 

[TTSX]

If you want to try before you buy, I can loan you my VG6. planning on putting a suppressor on the current host anyway.

 

[GOG]

@TTSX, thank you for the offer.

 

[powermad]

I believe you mean an 8" AR9 with the 7" handguard.

None of my 9mm pistols require a comp and I didn't feel one would be of any real use on my PSA 8" AR
Getting the action tuned made a bigger difference on mine in regards to recoil.
With a carbine buffer and spring it was way to fast, ejected brass into the next zip code and mangled the brass.
Red Dot bounce was real with it set up like that.

An AR9 likes around 18 - 23 oz of reciprocating mass for blow back ones with a stronger spring than the standard carbine one.

I next went with a carbine tube, Sprinco green spring (rifle) and a Vltor A5H4 buffer.
With a Law folder the adapter is nearly the same weight as the slug in the rear of the carrier that had to be removed to use it.
I needed a bit more weight, so cut the slug down a bit to fit the adapter and reinstalled it in the carrier.
That brought me to 22 oz IIRC and is about as smooth as a 9mm blow back is going to get.
Red Dot bounce is much better and more manageable, my 14 year old daughter doesn't have any trouble stinging the plate at 50 yds. With a CMC trigger it can pour the lead on target pretty quick.

I ran the 7" handguard for a while but needed more room up front so went with an Aero 9" handguard and swapped out the short KVP linear comp for a long one as I didn't care for the muzzle being a 1/4" from the front end of the HG.
I use mine with a regular lower and Endo mags.



I just swapped the lower over to another rifle, so now get to play the buffer game again to get back to 22 oz.
Really need a different upper as well, this one is so sloppy that an Aero lower with the adjuster isn't enough to compensate for it.
So much fore - aft movement that I had to shim the law adapter out .100" to keep the buffer detent from eating the buffer alive.

So if I get the BCM upper for another I'll have an upper to swap in.
That's if I don't scrap the whole deal and start over with a CMMG Radial Delayed Blowback 8" barrel kit.
To get smoother than the RDB you'll need to pony up a couple more kilobux for an MP5 or MPX

 

[GOG]

After listening to you guys I ordered a Kaw Valley linear compensator last night.
The weight should help a bit with muzzle rise and we'll just have to see how it goes from there.

@powermad, you are correct, it's an 8" barrel with a 7" handguard.

 

[uberguy]

Not true. Most that have shot both a reg 223/556 AR and a 9mm blowback AR will always state the 9mm has more recoil. Which is true, considering the mechanics involved with the 9mm version. Is it a lot of recoil, no, is it noticeable over other AR15s, yes.

I can't speak for most people, but recoil is considered to be less for a 9mm vs 5.56/223, but perceived recoil highly subjective - a blowback system feels different.

The only way to know is to try both and see how the shooter perceives the recoil. Agree that here, a muzzle break won't make much difference, but that a linear compensator will direct forward the sound and percussion, that many prefer.

 

[GOG]

Yeah, we'll start with the comp but I'll check into buffer and spring combinations. That's good info.