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Posted: 3/27/2007 7:07:18 AM EDT
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Nooby questions in reference to a can for a .45 ACP AR15. Does anyone make a suppressor that telescopes back over the barrel to reduce overall length? If one was made, what would be the drawback to such a design? Could the area that extends back over the barrel act as an expansion chamber? I'm not well versed in can mechanics other than looking at different baffle systems. |
The design you describe is known as a reflex suppressor. They are an older design and are popular in Europe, where suppressors are required by law in many countries, and are so cheap they're stacked in point-of-sale displays next to the cash register in European gunstores. Reflex suppressors are not made by any U.S. manufacturer that I know of, largely because they are not as effective in noise suppression as the cans now in production here. Reflex designs are fine when you are buying disposable $20 suppressors, but when you pay $500 for a can, you expect better performance than a reflex offers. |
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IMO, the reflex suppressor can be a very effective design, with the advantage of minimizing the protruding length off the muzzle. True, many (with the possible exception of the Ruskie models...) were not designed for high performance, but for mass production at low cost. This is probably why in general they lack performance. The thing is in the US market, there is such a variety of weapon types that the interface (there are 2 points of contact with the barrel for the reflex) between can and barrel is no longer standardized. This applies to diameter of the barrel as well as where any front signt or stock happens to be along the barrel back from the muzzle. Non reflex designs utilize standardization of the muzzle threading (or other clever mounting system), which is pretty easy to do for a huge variety of weapons. |
I don't know if it's the shortest, but the Gemtech Blackside is very short and very light. It's a non-boostered can. I played with one the other day at a silencer shoot with an HK Mark 23. The wet performance for the first few rounds was quite impressive; folks kept coming over to see if it was really a .45 can. |
| In my 30+ years experience, the back-over-the-barrel portion of a suppressor is effective in reducing bore pressure and gas blowback. However, it has little or no effect in reducing sound levels. What is important in sound reduction is the length in front of the crown. |
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If length in front of the crown is what affect sound reduction, how about can size? Does a larger inside diameter make up for reduced length? I'm thinking of reflex design (3-4" back over the barrel), shorter length past the muzzle and large can diameter. Sound plausible? |
My barrel is cut to 10" plus the blackside = 16". The can is very light so it handles very well. I will cut another 3" off when I get the UMP to keep the overall length around 16". It does blow a lot of shit back, a reflex can with 4-5 inches should help a lot with that.
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