Marine Cpl
.577 Tyrannosaur.
So what if I build an AR with an adjustable gas block closed off. Will this be legal? I say yes because as configured, it can only fire one round at a time? 
@freddy ?
@freddy ?
Straight Pull AR
- Thread starter Marine Cpl
- Start date
Phazer
.450/400 Nitro Ex
I'd say yes.
BTW...I was researching this a little while ago.
Could you sufficiently squelch escaping gases from your barrel's gas port by putting a low-profile gas block upside down, without gas tube, under your handguard?
Since this wouldn't be a bolt gun, with lever rotation to disengage bolt lugs, how hard would it be to pull back the bolt with a standard charging handle? Any more difficult than charging a rifle in the first place?
This would seem like a good use for a side-charging upper.
BTW...I was researching this a little while ago.
Could you sufficiently squelch escaping gases from your barrel's gas port by putting a low-profile gas block upside down, without gas tube, under your handguard?
Since this wouldn't be a bolt gun, with lever rotation to disengage bolt lugs, how hard would it be to pull back the bolt with a standard charging handle? Any more difficult than charging a rifle in the first place?
This would seem like a good use for a side-charging upper.
I have 3 straight pull bolt ARs, they charge easy enough (I used side charging uppers and removed the gas rings from the bolt). Reduce ammo consumption and are a blast to shoot. I also use undrilled barrels so there are no gas blocks, gas tubes and no way without machining to make the uppers into semi auto.
Marine Cpl
.577 Tyrannosaur.
I wouldn't even go as far as turning it upside down. I'd just turn it off. In it's current state, it wouldn't be semi auto.
Sure I can always turn it back on but I can always cut the barrel down too.
Sure I can always turn it back on but I can always cut the barrel down too.
turn it off and epoxy the hole shut....lmao
Phazer
.450/400 Nitro Ex
You could do that if you have an adjustable gas block. But.....
ArmedCorgi
.475 A&M Magnum
You could always just leave the gas block off so that the rifle spouts like a whale everytime you fire a round. You could even have a little confetti hopper on there to make things festive.
Phazer
.450/400 Nitro Ex
I think this upper looks interesting since the rear guide strut on the charging handle does not appear to exit the upper when charging:
Side Charging - Non Reciprocating Upper Receiver -Newest and Best available- Rousch Sports
Side Charging - Non Reciprocating Upper Receiver -Newest and Best available- Rousch Sports
Phazer
.450/400 Nitro Ex
Last edited:
Marine Cpl
.577 Tyrannosaur.
I once saw online a set of hanguards that screwed together. They needed to be unscrewed to be removed. I cannot find them now.
So anyway, Assuming you put this adjustable low profile gas block under the rails and change the screws to custom ones that require a one of a kind screwdriver to remove them or drill them out, no one could make it semi auto but you.
So anyway, Assuming you put this adjustable low profile gas block under the rails and change the screws to custom ones that require a one of a kind screwdriver to remove them or drill them out, no one could make it semi auto but you.
Phazer
.450/400 Nitro Ex
I wouldn't sabotage an adjustable gas block. (edit: Ohhh...I see...make the handguard hard to remove so that the gas block is in "off" position and cannot be easily reset w/o removing handguard).
I'd just put a cheap low-profile gas block in a skewed position (too far forward or too far back) in order to cover the gas port on the barrel.
Stop writing about this stuff! Or...this will become a project for me.
Phazer
.450/400 Nitro Ex
Phazer
.450/400 Nitro Ex
Actually...if you set the gas block to "off" and left off the gas tube, there'd be no reason to modify the handguard screws. You'd never be able to "readily modify" (read: on-the-fly) the rifle to semiauto functionality without having a set of tools to: Remove the hanguard, remove the gas block, install the gas tube (hardest part), and reassemble.
Marine Cpl
.577 Tyrannosaur.
Here we go. These handguards cannot be removed unless these screws are screwed off.
Now you replace them with custom screws like this limiting access to the adjustable gas block by a cop.
Now you replace them with custom screws like this limiting access to the adjustable gas block by a cop.
Marine Cpl
.577 Tyrannosaur.
Ha! Even better. Just remove the piston. I like gas pistons. Easy on easy off. It doesn't even require tools.
Phazer
.450/400 Nitro Ex
The clamp-on style handguards (as in my earlier post) are easier to work with. They use 4 screws to clamp the handguard onto a proprietary barrel nut. The advantage over the type you showed is that the clamp on ones don't need to be "timed" so that the mounting screws line up with the holes in the barrel nut. It saves a lot of time fiddling around with torquing the barrel nut in order to get the handguard to be in the proper orientation.
I'm not getting into this discussion but it has raised a side bar question. How well or at all does an AR run with the gas rings removed from a bolt? Does run like a single shot and not even move the bolt or does cycle it somewhat? I might need to experiment if no one has an answer.
GUNSICK
6.5 Creedmoor
I think this upper looks interesting since the rear guide strut on the charging handle does not appear to exit the upper when charging:
Side Charging - Non Reciprocating Upper Receiver -Newest and Best available- Rousch Sports
These are by Matrix Arms. I have this one and another in 9mm. Nothing comes out the back when charging. It has a two piece guide rod that collapse like a antenna when pulled back.
GUNSICK
6.5 Creedmoor
I have owned one of these and sold it because of the handle guide coming out of the back when charging. It's also heavy and looks huge on a mil spec lower. I also don't like that it uses a different cam pin and found it odd that a standard one seemed to work fine in it.
Marine Cpl
.577 Tyrannosaur.
I think it'll short stroke. Whether it chambers another round might depend on how strong the gas system is set. I'd like to know myself.
GUNSICK
6.5 Creedmoor
This has been around for years in England I believe. Can't get them in the states yet as far as I know.
Marine Cpl
.577 Tyrannosaur.
They would make a mint if they imported it.
That_FNG
.308 Win
Yes it is legal. Yes if you turn the gas block around or upside down it will seal off any escaping gases. I built one and love it. Runs flawless. Think of it like a modern day Swiss K31.
Phazer
.450/400 Nitro Ex
Phazer
.450/400 Nitro Ex
Looks like gun-grabbers are always on the march in the UK, too:
Police force ‘is warning shooters not to buy SGC or MARS actions’