TNA 180 SBR Build

[Bman12456]

So I have been looking to jump into this platform. What is the weight of your build? How difficult is it to assemble compared to the AR-15? I know TNA has been producing a bunch of parts for them but I've been wanting a good idea of what I can customize and what I can't, including the upper and lower.

Really like your build and your easy to read layout of parts!

I dont have a great scale but the weight is roughly 6lbs with no optic. Im hoping to be under 6.5lbs with optic, irons, and WML but we will see when it comes together. Id say you can probably take the weight of a comparable AR15, and add about a pound to account for the added weight of the upper, lower and gas system.

Assembly on these is super straight forward. Far fewer little springs and detents than an AR. Only real difference is the safety, it is retained by the bolt release spring riding ontop of it. Trigger is the same as an AR, aligning the gas block and piston is identical to aligning a standard gas block and tube.

 

[Ustauk]

The default gas port size on a WK barrel is drilled extra large to compensate for poor ammo and/or adverse conditions like extreme cold weather. This can be knock fasteners in the firearm loose. In particular, if the gas block's fasteners loosen, it can rotate out of alignment. This can cause torsion stress on the piston op rod, eventually leading to the piston rod snapping. It is advisable to apply high temperature thread locker to the gas block's fasteners, and then tightening them with the gas block in proper alignment.

The Modern Spotter's barrel's gas port will be drilled to a smaller standard. It may allow the firearm to function as is, but may need to be drilled out wider if the gun does not cycle your chosen ammo or cycle properly in adverse conditions. Depending on the gas port location, you will need the default WK piston op rod, a medium length one from Third Echelon, or a rifle length one from True North Arms. You may need a new handguard; a certain minimum height is required to accommodate the piston system.

If you want to use the Sporter's gas tube and handguard, you may want to wait until SBI releases its DI BCG for the WK.

The Modern Sporter uses all AR15 parts. Its "banned" in the frt which doesnt actually mean it is banned. But it does mean is that all it takes is one uneducated officer (most dont know sh*t about firearms) and you're spending a few months in prison while they sort out whether you actually broke a law or not.

Sorry, forgot to mention you won't be able to the Sporter's upper and lower receiver; as Bman12456 noted, the receivers' are verboten with the OIC/FRT changes. You can use the butt stock, trigger, pistol grip, optic, barrel and maybe the handguard from the Sporter, while your other parts, including the receiver, everything inside the receiver except the trigger, and piston system (and maybe handguard) will have to be from a 180 variant.

One more option, if you don't mind a boxy look, the Jard J180 uses a DI-ish Stoner pseudo piston to impinge an internal 180 recoil system. The builder kit comes with everything internal to the receiver, allowing you to re-home the Sporter's butt stock (though you will need an A2 to carbine adapter for an A2 stock), optic, magazines, barrel, gas block, gas tube and handguard. You can optionally replace the included pistol grip and trigger, though the trigger is supposedly fairly nice. Sylvestre Sport's in Bonneyville sells the kits over the phone, via email, or in person. You can optionally purchase a charging port dust cover, giving the firearm similar particulate ingress protection to that of the BRN-180.