Need a little advice on full auto upper...

[bm11]

Bought a transferable m16 about a month back, which means I should have it in another 11 months, give or take. I'm shopping around for an upper for it, planning on a .300 BLK as well as a 5.56, because of ammo price and availability. This discussion is relevant to the 5.56 upper.

I tend to prefer short uppers, but nothing shorter than 10 inches because of ballistics and suppressor warranty. This is going on a full auto gun, so cyclic rate is a concern, as is cyclic rate increase suppressed. I am leaning toward an adjustable gas block gun because of this.

The two fore runners at this point are the LWRC M6A3 12.7" and Noveske switchblock 10.5"/12.5". I settled on the A3 LWRC because of the adjustable gas block, and the 12.7" because it is a mid length gas system which is supposedly softer shooting than then carbine length system on the 10.5". Obviously it should be easier to clean than the Noveske and should require less lube, both because of the piston system.

The Noveske is a conventional DI with a switchblock. The benefit being that I have read is a DI gun is softer shooting which while not an issue on semi auto 5.56 shooting I imagine comes into play full auto, and that a DI gun is quieter than a piston.

My main concerns with the piston gun is the noise and the recoil impulse on full auto, and my main concern with the DI gun is the cyclic rate and the reliability on such a short suppressed full auto gun. Any input or additional suggestions would be great!

Thanks,

-Bob

 

[Fongman]

Re: Need a little advice on full auto upper...

I have an LWRC early model M6A2 on my M16 lower and have well over 10k rounds through the current configured upper without issue. It runs clean, cool, reliable and accurate and couldn't be happier.

With the price of ammo now-a-days, you'll get tired of the cost of mag dumps in a hurry.

As far as the recoil being harsher - I just don't notice it. And it's louder? That's news to me. I have another upper a KAC/ Noveske that I also use, but just not to the extent of the LWRC. The upper has taken quite a bit of abuse without a hiccup.

I also own an M6A3 16" barreled upper and love that gun as well.

I own both Noveske and LWRC and think they are both fine weapon systems.

 

[Turk]

Re: Need a little advice on full auto upper...

End your misery; go w/ a MK18 from Highcaliber!

 

[bm11]

Re: Need a little advice on full auto upper...

Turk, I know that you would go with a "spec" build, and I actually have considered it! But I am not overly concerned with going with a direct mile spec copy, and I think having an adjustable gas system is important enough for me that I will go with one of the options that have it. I plan on running the gun suppressed as much as possible, and the increased cyclic rate, especially on a straight DI gun, is something I'm trying to avoid.

Fongman- piston guns tend to meter louder because the piston vents compressed gas out under the handguard, where a DI gun vents it back into the action. From what I have read, it isn't really noticeable at the ear, and I have never done a side by side comparison. This is concerning suppression obviously, as either short configuration is stupid loud without.

 

[phxfa]

Re: Need a little advice on full auto upper...

I have a 10.5 M6-A3 I can demo for ya, with my 556-212,,,

 

[kimberseries1]

Re: Need a little advice on full auto upper...

FWIW, you can now buy the Switchblock from Noveske. $200 I think. Although, I think they use bigger ports on their bbl's, so if you're using a non-Noveske bbl, that may or may not impact cyclibility. I would have to defer to others.


Piston-heads will tell you shooting full-auto-supressed requires a piston to keep temps down, keep gas out of your face, stay much cleaner, etc., etc. Lube a DI w/Mobil 1 synthetic and you're probably wearing glasses anyway. I prefer a DI, regardless of FA/Supressed/SBR, but a piston may be for you.

LWRC M6A3 has adj. gas block, but I don't think they are presets like the Noveske. You'd have to play with it. Also, LWRC says they are running the M6A2 supressed/FA with no hiccups, so you should be golden without it. Although, don't remember if they were running SBR or not.....

I think the Noveske requires a dummy round to adjust, and there is a Machine shop that makes adj. gas blocks that don't require a tool to manipulate. Don't remember the name.....JP Enterprises? Or something sort of similar.


If you're running DI, try a coated BCG like Spike's or LMT(14.5"-16" only though). I'm trying one in the developing stages that's supposed to be better than NiB, NP3 or Chrome.

BCG coatings + Mobil 1 Synthetic + FA/Supressed/SBR = Easier cleaning.

 

[RWSGunsmithing]

Re: Need a little advice on full auto upper...

I bought a POF for mine because I like the ability to adjust the piston when shooting suppressed to unseppressed, well I have yet to fire the darn thing unsuppressed and I think you'll find that out as well.

So when it came time to build one for my wife (yes I know scarey isn't it) I decided to build my own on the cheap. Originally I was going to use a adams conversion but I didn't like the weight of the it and decided to go with a osprey with a DEZ barrel that I melonited. It runs great shooting everything from the cheap steel crap to the imi stuff. without suppressor it weighs in at 7.2 lbs.

 

[bm11]

Re: Need a little advice on full auto upper...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Tom Olson</div><div class="ubbcode-body">I have a 10.5 M6-A3 I can demo for ya, with my 556-212,,, </div></div>Hows it run full auto compared to a DI upper?

 

[phxfa]

Re: Need a little advice on full auto upper...

I really cant tell the difference between the Noveske 10.5 Switchblock or the LWRC in regards to function or noise suppressed or recoil. the 9 inch POF that I told you about, runs like a MG-42 suppressed or not

 

[bm11]

Re: Need a little advice on full auto upper...

Cool. If the piston gun doesn't recoil harder or sound louder, that is probably the way I'd go if only because it won't require quite as much cleaning.

 

[Fongman]

Re: Need a little advice on full auto upper...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bm11</div><div class="ubbcode-body">

Fongman- piston guns tend to meter louder because the piston vents compressed gas out under the handguard, where a DI gun vents it back into the action. From what I have read, it isn't really noticeable at the ear, and I have never done a side by side comparison. This is concerning suppression obviously, as either short configuration is stupid loud without. </div></div>

Well the meter may be able to tell, but I bet your ears won't.

Like I said either way you go I'm sure you'll be happy. BTW I still get gas face when shooting my LWRC 10" suppressed. Just not as bad as with a DI gun. The A3 gas block and a 12.5" barrel may help with that a bit.

 

[bm11]

Re: Need a little advice on full auto upper...

Yeah, I know gas face is going to happen regardless. I even get it with my 10" SCAR CQC which is a piston gun with a switch and it doesn't have a rear reciever charging handle like an AR.

 

[Turk]

Re: Need a little advice on full auto upper...

Gasbuster or RTV will take care of it.