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Perazzi MX15 Unsingle

5489 Views 13 Replies 10 Participants Last post by  ljutic231
I have a new MX-15 which I like very much. I would like to know whatover/under barrel will fit this gun, due to the high Rib? This would allow me to travel with one Gun instaead of two. Your information would be appreciated.
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On my MX-15, I aquired an older, Cat 3. 32" O/U barrel with the higher stepped rib. I had it converted to a cat IV. It fit the gun as it should have, and I had no trouble shooting it at all. Cost to convert the Cat 3 to Cat 4? $150.00. The results were priceless. I had the barrels back bored and choked .015" and .025" and they were perfect... Dan Thome (Trap 2)
 

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I believe I have the same type setup as Dan T on mine. I wouldn't consider the mx-15 a high ribbed gun though.....the rib height compared to a normal top single is not abnormal...

jim
 

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An MX-8 Trap barrel has exactly the same rib height as an MX-15 or an MX-8 Top Single Trap.

Art, you have to be careful here. What will actually work best for you is not necessarily what is theoreticaly "correct".

I had a 35" MX-15 barrel on my MX-2000 receiver. I loved it. I decided to make a combo out of it and bought a set of 32" MX-8 Trap O/U barrels. They were actually 31.5" long. Were they the same rib height? Yes, exactly. Did they work for me? No, emphatically. Why? Because I shot a high POI, 22" high @ 40 yards.

The difference of 3.5" in barrel length made a huge difference. When I raised my shorter O/U barrels to put the bead in the same bead/bird relationship I saw using the unsingle, my POI went way high and I shot over everything. The next step up in rib height is MX-10/2000RS O/U barrels. I'd really have been better off with them. Even higher is the MX-10 O/U. What you really ought to do is use your unsingle barrel as a guage. Determine what POI you shoot with it now. Then decide what POI you want at what distance for the O/U, and what barrel length you want. Then it is pretty simple to figure out what the bead height should be.

I solved my problem by going to a 35"/34" MX-2000RS barrel set. I found a set where the 34" O/U was within 1/4oz of the unsingle, so the swing dynamics were very close to the same. If I ever do this again, both the unsingle and the O/U will be the same length.

If you shoot a flat shooting gun, it doesn't make any difference how long the barrels are, you want the same rib height. When you get into the low POIs, say 6" to 9" high @ 40 yards, 1.5" - 2" of barrel difference in noticeable. At around 12" - 15" high, 1" of barrel difference is noticeable. When you get higher than that, you are better of with the same length barrels for the unsingle and O/U. If you have to have shorter barrels on the O/U, you'll have to raise the rib to compensate. How high a rib you need will be determined by how high you want your O/U to shoot.
 

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ZZT : Thank you for the information and you are absolutely right, in fact after thinking alot about this I contact Dan at Giacomo and will see what he has to offer at the Florida State shoot in Silver Dollar.

I tried my MX-8, 31.1/2 barrel on my Mx15 and it fits but the sight picture is not the same. I have a 1/4" difference between the beads and that will not work for me. i usually stack the Beads and shot about 3 to 4" High at 40 yards.

Thanks for your information it was very helpful. Art
 
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