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Discussion Starter #1
I was just curious as to why hk decided to use a non standard rail height? Looks like it just adds weight to the rifle
 

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I believe it is to allow enough space for the pusher rod assembly and the built-in bushing in the upper while keeping the upper and rail in-line with each other.

You will note that aftermarket piston kits require special handguards and most will not accept most freefloat rails unless they are milled out.
 

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Discussion Starter #3
Not my lwrc sir. Standard height rail, standard handguards and is piston operated (of course its an lwrc). So then I assume the op rod on the mr556 is massive?
 

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Discussion Starter #4
Oh and for other piston ar guys out there, SAMSON EVO. Awesome looking handguard and it bolts right up with no internal milling needed to fit over piston cup. Gonna order mine soon.
 
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