Most of the Blank Barrels I have come across, with the exception of one, have been all over red. The yellow one, is a picture of Kevin's that I use for showing what BFA barrel I'm referring to, as there are several.
I have used thousands of the blue L10z wood tip blanks with the solid BFA's and have had great success with them. I had tried to use the short blanks, but the aperture was far too big, and consequently there was nowhere near enough pressure to operate the action.
Before we discovered the wood tips, I actually went so far as to make some of the spacers for the mags so that they would feed the short blanks, and in conjunction with a regular Mk II barrel , which we had internally tapped and used a threaded restrictor, had some success, but were plagued by inconstant loads.
The aperture squeezes down from .311 at the rifled end down to .276 so as to prevent a solid wood bullet from exiting the barrel, although with the powder load behind it, it burns up pretty well before it exits the barrel. I have shot several at some paper targets within 10-20 feet, and there is virtually no debris going beyond 20 feet. As far as flash, well you can see by the picture.
The wood tips along with the solid BFA's have been the best result. As the picture shows.............
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