How far can I chop my 300 whisper barrel?

Machineguns, assault rifles, subguns, SBRs, etc. Photos, questions, discussion. General talk.

Moderators: mpallett, bakerjw

Post Reply
ranb
Silent But Deadly
Posts: 2002
Joined: Sun Sep 18, 2005 5:53 pm
Location: WA, USA

How far can I chop my 300 whisper barrel?

Post by ranb »

I bought an 18" 300 whisper upper back in 1999 and I'm finally chopping it down after getting my SBR ATF e-form 1 approved (only 3 weeks!). How far can I chop it?

The gas port is drilled 4.1 inches down from the bolt. It was chopped to 13.75" last year with a sleeve blind pinned on. I want to chop it further and turn the 1" thick barrel down to 0.700". I am planning on 10.7"; is this too short to ensure proper operation? Thanks.

Randy
SilencerTalk was a place I could disccuss making registered silencers without being told I was a criminal. That is no longer true. http://www.silencertalk.com/forum/viewtopic.php?f=132&t=99273
danb35
Silent Operator
Posts: 71
Joined: Fri Sep 27, 2013 8:22 am

Re: How far can I chop my 300 whisper barrel?

Post by danb35 »

What barrel length did you specify on your Form 1? That's the configuration you should build, at least at first.
ranb
Silent But Deadly
Posts: 2002
Joined: Sun Sep 18, 2005 5:53 pm
Location: WA, USA

Re: How far can I chop my 300 whisper barrel?

Post by ranb »

The 300 whisper upper will go on my AR-15 SBR which currently has a 12" 223 upper. Can I get it down to 10-11 inches without running into cycling problems?

Ranb
SilencerTalk was a place I could disccuss making registered silencers without being told I was a criminal. That is no longer true. http://www.silencertalk.com/forum/viewtopic.php?f=132&t=99273
danb35
Silent Operator
Posts: 71
Joined: Fri Sep 27, 2013 8:22 am

Re: How far can I chop my 300 whisper barrel?

Post by danb35 »

My 300 BLK SBR has a 10.5" barrel with a pistol-length gas system. So far, it works fine suppressed and unsuppressed.
User avatar
L1A1Rocker
Silent But Deadly
Posts: 3578
Joined: Wed Feb 21, 2007 5:40 pm
Location: Texas Hill Country

Re: How far can I chop my 300 whisper barrel?

Post by L1A1Rocker »

ranb wrote:I bought an 18" 300 whisper upper back in 1999 and I'm finally chopping it down after getting my SBR ATF e-form 1 approved (only 3 weeks!). How far can I chop it?

The gas port is drilled 4.1 inches down from the bolt. It was chopped to 13.75" last year with a sleeve blind pinned on. I want to chop it further and turn the 1" thick barrel down to 0.700". I am planning on 10.7"; is this too short to ensure proper operation? Thanks.

Randy
Have you been over to silencertalk's sister site, www.300blktalk.com? All silencertalk members were automatically active there when the site was launched.

LOTs of good info over there about the 300blk.

Anyhow, if you gas port is in the pistol location you should have no problem going down to 8"s. (You may have to open up the gas port a bit) There are people that have gone down to 6 but I've read that going below 8 can get into some tricky territory.
ranb
Silent But Deadly
Posts: 2002
Joined: Sun Sep 18, 2005 5:53 pm
Location: WA, USA

Re: How far can I chop my 300 whisper barrel?

Post by ranb »

Thanks. I forgot about that site; I'm registered for a while now there too. :)

Ranb
SilencerTalk was a place I could disccuss making registered silencers without being told I was a criminal. That is no longer true. http://www.silencertalk.com/forum/viewtopic.php?f=132&t=99273
Post Reply