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Posted: 2/18/2012 3:54:25 PM EDT
Please pardon another newbie question.

I've selected a 20" barrel with a rifle-length gas port position (SI Defense .308 SASS contour).

Do I need to select a particular gas block attachment mechanism?  Or ... is it all up to me whether I get one that clamps on, attaches by set screw, etc.?  I see 3-4 different attachment mechanisms listed.  So what I'm asking is whether a particular barrel will require a particular attachment.

2nd, will a rifle-length free float tube cover the the gas block (set at rifle-length gas port position) or would a railed gas block be a reasonable option?

Thanks!
Link Posted: 2/18/2012 4:58:40 PM EDT
It's up to you what type of attachment you want to use. Using pins will require some work, whereas a clamp on or set-screw type will do what the name implies.

A rifle length (12") free float will not cover your gas block. You would need an extended one, 13.2" and 15" are the ones I've seen.
Link Posted: 2/18/2012 5:03:19 PM EDT
Thanks, attworth!

In that case ... using this tube (probably) ... http://www.midwayusa.com/product/737264/dpms-free-float-tube-handguard-lr-308-rifle-length-aluminum-matte
I won't rule out a railed gas block.
Link Posted: 2/18/2012 5:07:38 PM EDT
Originally Posted By DanielWilson:
Thanks, attworth!

In that case ... using this tube (probably) ... http://www.midwayusa.com/product/737264/dpms-free-float-tube-handguard-lr-308-rifle-length-aluminum-matte
I won't rule out a railed gas block.


It all depends on what you think you'll want up there. A sight or something would be the only thing I could think you'd want on your block if you're free-floating anyway. A bipod or sling attachment kind of negates the free floating benefit.

Be sure you post pictures when you're done!
Link Posted: 2/18/2012 5:14:10 PM EDT
Originally Posted By DanielWilson:
Thanks, attworth!

In that case ... using this tube (probably) ... http://www.midwayusa.com/product/737264/dpms-free-float-tube-handguard-lr-308-rifle-length-aluminum-matte
I won't rule out a railed gas block.

If you think you need a front sight then a railed gas block would give you a mounting point in font of that rifle length handguard.
Make sure that you get the correct height sight.
Also, you may get a better gas seal if you go with a steel gas block as opposed to Alu.

If you want a longer-than-rifle handguard, make sure your gas block is low enough to let it pass over.
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