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Posted: 8/6/2017 1:03:50 PM EDT
| So I just picked up a 8.5" 300blk barrel for a pistol build and wanted to know which length rail to use, 8" or 9" ? Like the look of the Noveske PIG or KAK slim can under the rails but it has me wondering if a future suppressor will fit under the rails. What rails are you guys running on your pistol builds, likes, dislikes ? Pictures ? |
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Quoted:
So I just picked up a 8.5" 300blk barrel for a pistol build and wanted to know which length rail to use, 8" or 9" ? Like the look of the Noveske PIG or KAK slim can under the rails but it has me wondering if a future suppressor will fit under the rails. What rails are you guys running on your pistol builds, likes, dislikes ? Pictures ? 7.5" for no special compensator. |
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10" handguard will tuck a KX5 nicely on an 8.5" barrel , but you will not be able to tuck your can inside any slimline handguard. You will be forced to go with a fat free float quad rail or a Seekins MCSR. (large diameter) to tuck any 30 cal can.
If you want to butt the can directly up to the end of the hand guard for a seamless look you need 3/4" offset for your barrel length i.e your 8.5" barrel would need a 7.75" or shorter hand guard for any QD silencer mount to work, otherwise your can will bottom out and come into contact with the handguard. We use a 7.25" rail on our 8" blackout barrels and the silencer ends up with about 1/8th" clearance when mounted which is perfect Hope that helps |
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A good rule of thumb for AR barrels is that your rail must be 3/4" shorter than the stated barrel length for a flush fit, or 1"+ to extend past the handguard. |
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My above reference was for QD mounts. Direct thread is different and I still use that rule of thumb just to be safe. Either way if you only have a half inch difference your threads may be slightly buried. With .75 difference the threads are just barely fully accessible. I.E Daniel Defense MK18 RIS hand guards are 9.55" exact top rail length to mate with a 10.3" 5.56 barrel and get the can tight to the hand guard with a QD mount..
Here is a 10.5" barrel with 9.7" handguard. Threads are barely exposed 
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