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The RPP 10/40SS is a unique rifle, so much so that it is the first of its kind. It represents a number of extraordinary developments in the Marlin lever-action platform, if not repeating rifles as a whole class. To our knowledge, there is nothing else like it.

To begin with, this rifle could not have been built without first developing our exceptional M/94 Extractor Claw, which itself was the product of months and months of intensive R&D work. Unlike, say, the .38spl and .357 mag, which headspace on their rims, the 10mm auto and .40 S&W headspace on their case mouths. So while the longer 10mm headspaces normally in this rifle, the .40 S&W round is held against the bolt face by the extractor alone.

Firing the .40 S&W in a 10mm chamber requires that two conditions are met: 1) the action must be set up for controlled round feed--ie, the extractor must take control of the case rim immediately during carrier lift--a matter of split second timing when two disparate cartridges are involved; and 2) the extractor must hold onto the case rim, and remain undamaged, under repeated duress, as the firing pin smacks the primer, driving the cartridge forward against the extractor. Only RPP's M/94 Extractor is tough enough to handle this punishment.

A host of modifications and careful tuning are necessary to achieve the foregoing conditions. It is important to note, that despite our best efforts (to date) time and gravity may still affect the feeding of .40s in the Marlin. The 10mm cartridge, being long enough to span the carrier bed, will run as reliably as any firearm can be made to run, but while the .40 will run reliably under most conditions, there are circumstances under which it may malfunction.

For this reason, the .40 S&W should be considered a bonus round, good for cheap plinking and small game hunting, but it should not be relied upon for critical duty.

A note to handloaders: because the RPP 10/40SS has a 10mm chamber, .40s may be loaded longer than normal with no ill effects. In fact, longer .40s will cycle with even greater reliability than shorter ones. Increased charges should, of course, be worked up with great.



 

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This caliber should make some people happy, ha! Nice work RPP Team... as always.. :)
Just noticed the take-down screw in the pic too w/logo, and somehow missed that item in the past and had to go check your website about it... pretty neat! Keep up the good work.
 
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Discussion Starter #3
This caliber should make some people happy, ha! Nice work RPP Team... as always.. :)
Just noticed the take-down screw in the pic too w/logo, and somehow missed that item in the past and had to go check your website about it... pretty neat! Keep up the good work.
Thanks AZ. So far, everyone locally that we've shown it to went gaga for it. We already have a few orders.

Yes we're making our own tool-less quick takedown screw now. The six rounded points make it really easy to screw it on and off in the field or at home. We offer them in blued steel and stainless steel.
 

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Very nice and an excellent idea..... this will make a nice addition to my 10mm woods carry gun. Looking forward to more details/pricing.
 
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Discussion Starter #7
Interesting design. How much?
Thanks kingsrider. It's $1,800 for the base conversion + donor rifle. In a 17.5" barrel, you get 12+1 rounds 10mm; 13+1 rounds .40 S&W.

Here's a link to the page with all of the info.
 
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Discussion Starter #8
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Discussion Starter #11
What about ballistics of the .45 A.C.P. round from the rifle barrel. Did I miss it when I went on your web page?
Similar to a pistol but they gain about 150-200 fps more with factory ammo in a rifle and even more with hand loads. We've been building a ton of 45ACP's.
 
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Discussion Starter #13
Will there be a time when this is offered again?
No sir. We are now focused heavily on our manufactured parts business.

Kimberly


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No sir. We are now focused heavily on our manufactured parts business.

Kimberly
...
Is there anyway this will ever be available again? Restarting manufacturing? Selling/licensing the patent? This seems the the perfect solution; the "Gun Trifecta", Handgun, PCC, and Lever gun all in the same caliber. With good marketing, I think this would be a great seller!
 

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Is there anyway this will ever be available again? Restarting manufacturing? Selling/licensing the patent? This seems the the perfect solution; the "Gun Trifecta", Handgun, PCC, and Lever gun all in the same caliber. With good marketing, I think this would be a great seller!
I believe they granted Grizzly the rights to do the conversion. Website says $2495 plus your donor rifle....
 
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