Budget 300 Blackout Build - Suppressor Suggestions

[murph1118]

I’m doing a budget build for a 300 blackout pistol. I bought a complete gun from PSA - 7.5” barrel:

https://palmettostatearmory.com/psa...ght-m-lok-moe-ept-sba3-pistol-5165449201.html

So far just got the basics…Magpul P Mags, PSA 2 stage trigger, Streamlight, Sig Romeo 5, etc. I was originally not planning to suppress but decided I’d like the option. I’d like to keep this build as simple as possible (I’ve done more complex builds but just want to keep this simple) so I don’t want to mess with an adjustable gas block or anything of that.

Do any of you all have any suggestions (especially if you have experience with this gun) for a good suppressor WITHOUT AN AGB that would run subsonic reliably that I could quick detach to run supers when I want? I’d also like it to be able to be used with my 6.5 CM for long range when I want to.

 

[oldrifleman]

A good flow through suppressor lick a cat ODB, Velos lbp762, Hux flow 762ti would work on it for both subsonic and supers. I run a Cat ODB or AlleyCAT 762 on mine and it runs fine.

 

[murph1118]

FYI Silencer Shop recommended the Surefire SOCOM 300 SPS for this use case. Any thoughts?

 

[murph1118]

A good flow through suppressor lick a cat ODB, Velos lbp762, Hux flow 762ti would work on it for both subsonic and supers. I run a Cat ODB or AlleyCAT 762 on mine and it runs fine.

Thanks! I'll take a look at these, too! You have the same setup? i.e., PSA 300 blackout 7.5" with 1:8 twist?

 

[oldrifleman]

Mine is a LMT 9" 1/7"

 

[Deepwoods]

The SOCOM 300 SPS is very good. It also relatively heavy and has more amounts of back pressure than the higher flow alternatives.

I have one and it's on a bolt gun so I don't have to deal with the blowback. I don't mind SF muzzle devises, but they are on the longer and heavier side....

The higher flow cans (which I prefer) may require a larger gas port size to reliably cycle a wider range of subsonic ammo. You may not know until you try. One of my uppers liked Federal 220gr but with Fioochi 220 it would cycle but not lock back.

If you aren't shooting supers a lot of rapidly, the Ti ODB is very good.

I *love* my HUX cans for supersonic, but Ive heard their previous generation HQ QD 762 with subs and it was OK. Certainly not *loud*, but the few shots I took indoor with no ear pro wasn't great. The Ventum, which I own, was a bit better, but it hasn't wowed me. Or rather, it's pretty good and the ODB is very good.


Regarding magazines... You *might* have feeding issues with regular Magpul (556) magazines and the heavier subsonic rounds. If you look toward the front, on either side, there are little tabs that help keep a 556 round straight in the magazine. With the larger/ fatter bullets of the subsonic 300, those tabs can-but-dont-always cause miss feeding.

The solution is the 300 specific Magpul magazines (where those table are smaller), Lancer mags seem to work well (though Lancer also has 300 blk specific options) or Dremel the tabs on the magpul 556 so it tappers/ ramps down to the wall of the magazine. I did this recently and it seemed to work.

 

[murph1118]

The SOCOM 300 SPS is very good. It also relatively heavy and has more amounts of back pressure than the higher flow alternatives.

I have one and it's on a bolt gun so I don't have to deal with the blowback. I don't mind SF muzzle devises, but they are on the longer and heavier side....

The higher flow cans (which I prefer) may require a larger gas port size to reliably cycle a wider range of subsonic ammo. You may not know until you try. One of my uppers liked Federal 220gr but with Fioochi 220 it would cycle but not lock back.

If you aren't shooting supers a lot of rapidly, the Ti ODB is very good.

I *love* my HUX cans for supersonic, but Ive heard their previous generation HQ QD 762 with subs and it was OK. Certainly not *loud*, but the few shots I took indoor with no ear pro wasn't great. The Ventum, which I own, was a bit better, but it hasn't wowed me. Or rather, it's pretty good and the ODB is very good.


Regarding magazines... You *might* have feeding issues with regular Magpul (556) magazines and the heavier subsonic rounds. If you look toward the front, on either side, there are little tabs that help keep a 556 round straight in the magazine. With the larger/ fatter bullets of the subsonic 300, those tabs can-but-dont-always cause miss feeding.

The solution is the 300 specific Magpul magazines (where those table are smaller), Lancer mags seem to work well (though Lancer also has 300 blk specific options) or Dremel the tabs on the magpul 556 so it tappers/ ramps down to the wall of the magazine. I did this recently and it seemed to work.

This is great, thank you. So would a higher back pressure help with cycling subsonic with no AGB? Or would it have the opposite effect? I'm brand new to this suppressor stuff...trying to learn here. Really appreciate the help guys!

 

[oldrifleman]

SubSonic 300s need a bit of back pressure to cycle reliably, The Cat suppressors are not as free flowing as the Hux Flow series. I am sure other s work well I am just not familiar with them.

 

[TonyAngel]

If you're going budget, I'd at least check out the YHM R45. Its been a heck of a do it all can. For what you're thinking about doing, no adjustable gas block shooting subs suppressed and supers unsuppressed you are going to want a high back pressure can.

I have not seen a scenario where you can run both supers and subs either suppressed or unsuppressed without the use of adjustable gas. Without adjustable gas, a standard baffle stack can will probably work the best. That way you can tune it to run subs suppressed and then supers should run fine when I you remove the suppressor.

Personally, I'd just bite the bullet and get an adjustable gas block. I run all 300 BO suppressed, whether supers or subs. With the R45, subs are pretty dang quiet. What I hear mostly is the clack of the bolt running. With supers, it's a LOT less loud.

For the price and within its barrel restrictions, the R45 is a good performer.

I'm kind of surprised at all of the recommendations for flow through suppressors. The purpose of a flow through suppressor is to make your rifle think it isn't running a suppressor at all, in terms of back pressure. That puts you back at square one trying to run both subs and supers with an unsuppressed rifle, without having to adjust the gas.

If anyone has accomplished this, I'd sure like to know how.

Of course there varying degrees of "flow through" and some may be much less flow through than others.

 

[MO Fugga]

Thanks! I'll take a look at these, too! You have the same setup? i.e., PSA 300 blackout 7.5" with 1:8 twist?

I have that upper. It can cycle most subsonic unsuppressed, which is nice. 2 other barrels I used do not.

 

[murph1118]

I have that upper. It can cycle most subsonic unsuppressed, which is nice. 2 other barrels I used do not.

That's good to know! I got some Hornady 190 subsonic to try.

I'm leaning Surefire SOCOM 300 SPS and Omega 300, but likely the Surefire.

 

[TonyAngel]

I have that upper. It can cycle most subsonic unsuppressed, which is nice. 2 other barrels I used do not.

If it cycles subs unsuppressed, I suspect that it is grossly overgassed when shooting supers.

@OP, needing an adjustable gas block may be inevitable.

 

[TonyAngel]

@murph1118

Man, if this is your first 300BO, once you shoot it suppressed, you're going to want to shoot it a lot more. Unless you're either made of money or load your own, ammo cost will be a factor. Cheap FMJ subs start at about .70 a round, but you can get decent supers for closer to .50 a round.

I typically load up on the AAC 110gr Saber Blades when they go on sale at .50 a round. Shooting supers suppressed is pretty fun and satisfying. About as satisfying, or moreso, as shooting an 11.5 5.56 with a good can on it. With an R9 on the end of my 8", its a little uncomfortable without earpro. With the R45, it reaches a level of not offensive to the ear.

For me, the notion of shooting only subs suppressed, was either going to leave me not getting to shoot my 300BO as much as I want or even more broke than I already am.

Getting 147gr ball ammo from a lot of places that dont charge for shipping at .50 a round is the most economical Ive found. The AAC stuff works out to more like .60 a round after shipping and tax, when they're on sale.

 

[db2000]

If it cycles subs unsuppressed, I suspect that it is grossly overgassed when shooting supers.

@OP, needing an adjustable gas block may be inevitable.

I’m in agreement. You can try without an agb but as stated that’s gonna be seriously over gassed.

 

[murph1118]

I was also suggested the B&T SRBS 7.62, SilencerCo Sythe, and Hux Flow 7.62 for this application. So many to choose from!

 

[Deepwoods]

I have 2 noveske barreled uppers; I bought the 10.5" one from them and it can cycle subs unsuppressed and it came with a fixed gas block. The other is a 7.9" barreled DIY upper that I built with an AGB so that I could adjust for supers... which I have found I haven't shot much of and so it always stayed fully open.

I was going to try a different AGB but on a whim decided to try the OEM non adjustable GB since I have liked how the 10.5" upper shoots and the relatively little gas leakage it has. (Given how hard the GB pin was to hammer in, I think it will stay this way )

I shoot long guns left-handed and even with an AGB tamming recoil, a low flow/ high back pressure can will eject gas in my face. It is for this reason I prefer higher flow cans. Both of these uppers have KAK down venting BCGs which help.

I have found the HUX cans to be the highest flow and if I was shooting a lot of supers, I'd likely pick the FLOW 762 Ti (which I have and which I like a lot for 556 and 308). But for subs, the HUX cans seem not to perform as well. Fine? Sure, but... There are a few posts elsewhere here with more first hand comments that the HUX cans aren't ideal for subs. (To be clear, I *love* my OSS and HUX cans for super sonic gas gun stuff.)

Should I shoot supers out of these uppers, I'll put a heavier buffer in. I know that's not the best solution but I accept the trade off.

Other uppers have either a regular or piston AGB and so I'll use them if I'm shooting supers.