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The FS2K barrel conversion was a royal b--!
The top end must be fully disassembled to get the barrel out. Then the pin holding the flash hider in place must be drilled out.
I have no idea what the thread pitch is, but it's reverse and metric. I found an adapter on Gunbroker for it to take 1/2-28 accessories.
Then, the adapter was installed (and boy was it a b- it was tight! even without the blind pin it's never coming off again), the levang linear compensator was installed over that, and BOTH units were drilled for a blind pin, and pinned in place BEFORE reassembling the upper.
As far as putting a brake right on the barrel- 1. I don't think anyone makes anything in that thread pitch, it's weird. 2. you won't have enough length to meet the 30" minimum. 3. you have to fix it permanently to meet 922r. Oh... 4. the OEM FS2K barrel has an additional 'slot' for a pin which is not present under th erear ;shroud; of the OEM FH. When you remove it' it's quite ugly. The thread adapter and OEM FH covers this.
Another option is to remove the OEM FH and lathe it down, and turn the end into 1/2-28 threads. I thought of doing this until I saw the adapter on auction. A turned/threaded unit would probably give you enough length to meet the 30" min. also. Be sure to pin or weld BOTH attachments in place.
As to loading the PS90- the mag is fixed, but readily slides back and pivots upwards a few inches- plenty to get a hand under there and load up. You can also slide off the upper to load, but why bother? The FS2K is totally featureless so I can use my old AR mags. The PS90 can only use a 10 rounder anyways, so the ergonomic sacrifice of a plugged thumbhole isn't worth taking detachable 10rd mags, IMO.
As far as work to complete- the PS90 was a walk in the park. Aside from the dye job, the rest of it can literally be done with a hand drill (to put a hole through the mag and block plate).
The FS2K will require a mill and a SOLID vise to complete the barrel mods. I'd recommend a CARBIDE mill bit to drill the blind pin out- it's relatively hard and drill bits tend to walk.. The thumbhole plug was cast from 'Monster cast' and painted with hammerite
(bought the flesh tone stuff by accident!)
-Dave
The top end must be fully disassembled to get the barrel out. Then the pin holding the flash hider in place must be drilled out.
I have no idea what the thread pitch is, but it's reverse and metric. I found an adapter on Gunbroker for it to take 1/2-28 accessories.
Then, the adapter was installed (and boy was it a b- it was tight! even without the blind pin it's never coming off again), the levang linear compensator was installed over that, and BOTH units were drilled for a blind pin, and pinned in place BEFORE reassembling the upper.
As far as putting a brake right on the barrel- 1. I don't think anyone makes anything in that thread pitch, it's weird. 2. you won't have enough length to meet the 30" minimum. 3. you have to fix it permanently to meet 922r. Oh... 4. the OEM FS2K barrel has an additional 'slot' for a pin which is not present under th erear ;shroud; of the OEM FH. When you remove it' it's quite ugly. The thread adapter and OEM FH covers this.
Another option is to remove the OEM FH and lathe it down, and turn the end into 1/2-28 threads. I thought of doing this until I saw the adapter on auction. A turned/threaded unit would probably give you enough length to meet the 30" min. also. Be sure to pin or weld BOTH attachments in place.
As to loading the PS90- the mag is fixed, but readily slides back and pivots upwards a few inches- plenty to get a hand under there and load up. You can also slide off the upper to load, but why bother? The FS2K is totally featureless so I can use my old AR mags. The PS90 can only use a 10 rounder anyways, so the ergonomic sacrifice of a plugged thumbhole isn't worth taking detachable 10rd mags, IMO.
As far as work to complete- the PS90 was a walk in the park. Aside from the dye job, the rest of it can literally be done with a hand drill (to put a hole through the mag and block plate).
The FS2K will require a mill and a SOLID vise to complete the barrel mods. I'd recommend a CARBIDE mill bit to drill the blind pin out- it's relatively hard and drill bits tend to walk.. The thumbhole plug was cast from 'Monster cast' and painted with hammerite
(bought the flesh tone stuff by accident!)
-Dave
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