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Anyone try the Briley One shot extension for the Benelli M4?


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I'm thinking of getting the Briley One shot extension. Since I have the Carlson Breaching choke I think there will be enough length on the barrel but Briley's web site doesn't give any specs on how long the One shot extension is. Anyone have one that they can measure for me? 

 

Thanks !

 

 

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I already have the choke so not inclined to change it out. I'm still curious so I sent an email to Briley to see if they would provide the dimensions on their One Shot extension.

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Edited by GTTom
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  • 3 weeks later...

Follow up on this thread: I contacted Briley tech service and they sent me a CAD drawing of the One Shot with measurements. It was a 1:1 sketch so I printed it, cut it out and using it as a template it looked like it would fit. Ordered the One Shot extension and it came in last week. it FITS! For clearance I have to install the One Shot extension first then screw in the Carlson choke. Just enough clearance doing it this way. Now that it it fits I had to address the issue of not getting the last round in the magazine. Thanks to the info from @Birdog19 post in this thread I was able to shorten the magazine spring without a lot of trial and error. Shortened the spring to 16" sticking out of the magazine and it fit 8 rounds but it felt like the last round was binding the spring just a bit. Cut the spring back to 15" and it leaves some clearance after the last round. Good to Go! I'll hit the range tomorrow and runs dome rounds through it. Pretty happy with the outcome though.

 

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Edited by GTTom
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Went to the range yesterday. Everything worked great. No problem loading 8 rounds. Not FTF. Ghost loaded 10 rounds. Boy was that fun😄

Action shot of my buddy who emigrated from Scotland. He sent the photo to his friends in Europe titled" Sunday morning Merica!". You can see the flash pattern from the breacher choke.  

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Edited by GTTom
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  • 2 months later...
On 10/17/2020 at 1:57 PM, GTTom said:

Follow up on this thread: I contacted Briley tech service and they sent me a CAD drawing of the One Shot with measurements. It was a 1:1 sketch so I printed it, cut it out and using it as a template it looked like it would fit. Ordered the One Shot extension and it came in last week. it FITS! For clearance I have to install the One Shot extension first then screw in the Carlson choke. Just enough clearance doing it this way. Now that it it fits I had to address the issue of not getting the last round in the magazine. Thanks to the info from @Birdog19 post in this thread I was able to shorten the magazine spring without a lot of trial and error. Shortened the spring to 16" sticking out of the magazine and it fit 8 rounds but it felt like the last round was binding the spring just a bit. Cut the spring back to 15" and it leaves some clearance after the last round. Good to Go! I'll hit the range tomorrow and runs dome rounds through it. Pretty happy with the outcome though.

 

E36C8002-8E60-49CE-B312-520C1E89A69B.jpeg

16CDD18E-55F4-4429-9721-9FD1C09C5427.jpeg

84A3BB35-242C-4F63-8657-B0AA765675DE.jpeg

CA7DD708-6B47-461D-802A-79DBA91D3AA9.jpeg

28ADC5E1-E1C3-4BAC-958F-E33D59AE056B_1_201_a.jpeg

9C29E36E-FB32-4E01-BC6B-304F500FEF19_1_201_a.jpeg

quick question, once you twist the extension off, does the spring come out or is there a c clip in place?

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14 hours ago, Butters149 said:

quick question, once you twist the extension off, does the spring come out or is there a c clip in place?

As gm2376 mentioned , there is no C clip used with extension. Since the spring isn't captured by a clip it can take a little practice to remove the extension without the spring flying out. There is a small hole in the end of the extension. I stick a small screwdriver in the hole which helps to capture the spring in the extension while you screw it off. 

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