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Posted: 10/20/2014 9:58:57 PM EDT
[#1]
All of the SBR repots I've come across over the years have stated that cutting down a 16" (415mm) barrel to a mid length barrel (314mm) did not require a gas system mod.
Mods have only been necessary for cutting a 16" barrel down to Krinkov (210mm) length. If I remember correctly, the gas port has to be enlarged a tad bit. |
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Posted: 10/21/2014 7:44:46 PM EDT
[#2]
Does anyone know if a 45 degree crown is bad.
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Posted: 10/21/2014 10:13:51 PM EDT
[#3]
I have an SLR107cr that I SBR'd a few years ago. I cut the barrel with a saw and used crowning tools from Brownells to cut the crown. I went with a 90 degree crown and used a 45 degree cutter just to break the edge. I didn't have to do anything at all to the gas system. I have an original Russian cone type muzzle booster on mine. It functions fine with or without the booster mounted.
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Posted: 10/22/2014 9:08:24 AM EDT
[#4]
I want to crown it for 11° but there all sold out. Everywhere. I have a 45° tool from brownells
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Posted: 10/22/2014 9:21:00 AM EDT
[#5]
Quote HistoryQuoted:
Does anyone know if a 45 degree crown is bad. Very bad. bullet needs to leave the rifling at 90 degrees. ETA I miss understood about your crown. YOu want to use 45 degree crowing tool. You also need 90 degree tool. |
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Posted: 10/22/2014 9:54:46 AM EDT
[#6]
What's the 90 for. I read alot of people just using the 11
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Posted: 11/6/2014 8:08:54 PM EDT
[#7]
You also need 90 degree tool.
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Posted: 11/6/2014 8:35:17 PM EDT
[#8]
I cut the barrel with a saw and used crowning tools from Brownells to cut the crown.
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Posted: 12/9/2014 4:38:57 AM EDT
[#9]
I have alway used 11 degree crown with stellar results. 11 degrees has become standard amoung target shooters for good reason.., very consistant results!
They often recess the crown a bit as well to protect it. I personally would not go with a 45 degree crown. If you can't wait for an 11 to become available.., a flat 90 would yeild much beter results than a 45! |
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