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Posted: 9/8/2004 5:20:22 AM EST
[Last Edit: 9/8/2004 6:09:00 AM EST by dmuldrew]
What size, is it just drilled out? 20" Bushmaster upper, custom 5R barrel, SPR profile. Yeah I read the FAQs on this, now I am really confused!
Link Posted: 9/8/2004 7:24:51 AM EST
From here: http://groups.msn.com/TheMarylandAR15ShootersSite/maintenacefaq.msnw

Relevant info below:

Barrel Lngth (in) Barrel Dia (in) Dist from Muz (in) Min Port Size (in) Max Port Size (in)
11.5 .625 3.850 .081 .089
11.5 .750 3.850 .086 .094
14.5 .625 8.375 .063 .078
14.5 .750 8.375 .070 .086
16 .625 8.375 .063 .078
16 .750 8.375 .070 . 086
20 .625 6.875 .086 .093
20 .750 6.875 .093 . 096
24 .825 N/A . 089 .089


BTW, here's some other relevent info, sorry no 20" data tho.....

Colt's gas port sizes are: [10.5" - .093] [11.5" - .081] [14.5" - .063] [16" - .063]


Perhaps this will help,
Mike
Link Posted: 9/8/2004 7:02:33 PM EST
Mr Wilson

I believe the distance to the muzzle is the same for 14.5 and 20" barrels.

Otherwise, great table.
Link Posted: 9/8/2004 10:10:02 PM EST
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