You do, but just because a flash hider is covered, it doesn't stop being a flash hider. There's other issues with the diameter of the FH on it too - even if you wrapped it up in a tube, it'd serve more as a conical FH than the original factory device did.
You could go that route with the back, but in the opinions of a bunch of folks I've talked to, it totally destroys the rifle's ergonomics when you extend the rear. Length of pull shifts, etc.
Extending the front is the only real way to go on the PS90's.
As for the front grip... like I've said, it's close enough that it should be regarded as one for legal safety's sake.
You could go that route with the back, but in the opinions of a bunch of folks I've talked to, it totally destroys the rifle's ergonomics when you extend the rear. Length of pull shifts, etc.
Extending the front is the only real way to go on the PS90's.
As for the front grip... like I've said, it's close enough that it should be regarded as one for legal safety's sake.
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