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As I understand it, the whole concept behind the FF handguard is to reduce external stress on the barrel to improve accuracy and to reduce heat transmission to the handguard. I would think, however, that given the physics of the mount, with more movement possible the further away from the barrel nut mounting spot, they would be less desirable because they wouldn't be as "stable" for a FF handguard mounted front sight. The solution for that would seem to be to mount an end cap to the barrel/handguard. But doesn't/wouldn't that defeat the ostensible purpose of mounting a FF handguard?
 

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A good free-float hand-guard assembly will be able to support a bipod, sling and front sight without effecting POA. Or use a good float hand-guard and barrel that will allow the front sight to be attached to the barrel. Only use a free-float hand-guard end-cap that has plenty of gas tube and barrel clearance.
 
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