The blasters were made by Man of War Studios, so maybe Christian can answer questions about construction. 
UPDATE: Feb 29th
OK, these pics span several steps from last night to this morning. As I mentioned above, after I had "blocked in" the deeper details with a brush, I sprayed the entire blaster with Krylon Ultra Flat Black. The Krylon gives really good coverage, and as I will be doing additional colors/weathering, I wasn't concerned about the dead flat finish.
Once the Krylon black was dry, I hit it with a couple of coats of Krylon Matte Clear Finish, which is actually sort of in between matte and satin. I've used it before and it gives great protection for the base coat. No pics from this stage.
I let the Krylon clear dry overnight, and then this morning I masked off everything that was "not Webley." The scope, scope mount assemblies, and the clamp rings around the barrel.
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On the main body of the Webley, I airbrushed some Testors Metalizer finish in Burnt Iron. This gives a subtle color shift between the Webley's body and the other accessories built onto the blaster. It's a very dark bronzy looking tone. Here's how it looks after the masking was removed.
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Depending on the lighting, the color shifts from almost pure black to dark bronzish-black.
Here's the other side.
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The main body will receive additional variances in the finish once I do the base weathering on the rest of the blaster.
Next I'm going to determine what method to use to attach the stock, then I'll do a base coat on it. 
