Derya MK-12 range report

cr5 said:
Some more searching and now I'm torn between this one and the Typhoon F-12


Is the gas system on the Derya adjustable or self regulating?
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Try both before purchasing because the MK12's has a reportable softer recoil due to the patented "PowerPull Gas Operating System" which negates the requirements of a brake like the F12. The breakdown of the MK is also very fast.

Gas system is self regulated. I should take pictures of a stripped down shotgun and post pictures.
 
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My Range trip resulted in a few FTF with the 2 round magazines and 2 3/4 slugs. 3" slugs worked flawlessly with fireballs out the muzzle. Some investigation revealed that the follower got stuck and was rectified after some dismantling cleaning and proper lube.
 
Sqr said:
They are proprietary and are OEM located on the left side of the front rail and the buffer tube plate. They are similar but not exact to the attached picture.

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Thanks! I was hoping those holes on the side rails were QD sling mounts. Wishful thinking I suppose.

Is it possible to load through the ejection port on an empty mag?
 
grimreefer said:
Thanks! I was hoping those holes on the side rails were QD sling mounts. Wishful thinking I suppose.

Is it possible to load through the ejection port on an empty mag?
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Unfortunately it is not a QD mount.

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1da110fcb8622330e54c56a38cdea667_zpsqvsnbxln.jpg


I have not personally tried port loading and may try next time at the range. I really don't like to port load most semi automatic firearms unless it's at a controlled dedicated location.
 
Just committed to purchase a new green one. Adding a spare 2 round and 2 spare 5 round magazines and just waiting for final price quote before paying.
Had to sell my Kriss Vector to pay for it but since I haven't shot that one in a few months I'm not going to lose any sleep over it. Pretty excited to get my new toy now :)
Think it's either getting my Aimpoint PRO or the T1.


Edit,
Paid for, will be shipped tomorrow :)
 
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My 2 Derya MK12's arrived monday. Thanks to TandT Arms for their wicked fast shipping.

So, here is my experience. Gun comes in, go to CDN Tre, buy a case of trap loads, and some clays. Go to the range and blast off 6 boxes of Federal Target loads at the range, and 3 boxes of slugs. 3 FTE's on a gun not broken in, and in need of a clean and lube now.

Take the Derya home, clean thoroughly of the nasty mineral oil lube the gun ships with, and use some Royal Purple 140 diff oil on the parts that move, except the actuator which gets pennzoil red synthetic Wheelbearing grease.

4 more boxes of fed target load, with only 1FTE.

Switching to my own AA Target loads 7/8oz using high brass grey hulls, 250 rounds and not one FTE.

Time to clean again, inspect, and then do some more break in time.

Tearing the gun down is easy, some clearances are tighter than my winchester auto, but I think the grease will work fine. If not, I will switch it all to Royal Purple.

So far, no undue wear, I can see some areas wearing in and bedding properly. So all looks good for a long term gun that will run reliably.

With that said, 250 more rounds will be fired this week to break in the gun, and then I will be more confident in the gun. Most auto loading shotguns need 500-1000 rounds for all clearances to be finalized, and properly broken in. Powder residue is the bane of autoloaders, and the Derya seems to run a little cleaner than my wingmaster.

That's all I can contribute so far


Edit: CAREFUL of the chokes.... make sure to clean them and get that nasty mineral oil off them and get a proper GREASE on the threads... otherwise the chokes will walk out on you. This is not a criticism but common sense to most people who run guns with remchokes.
 
Got Juice? said:
My 2 Derya MK12's arrived monday. Thanks to TandT Arms for their wicked fast shipping.

So, here is my experience. Gun comes in, go to CDN Tre, buy a case of trap loads, and some clays. Go to the range and blast off 6 boxes of Federal Target loads at the range, and 3 boxes of slugs. 3 FTE's on a gun not broken in, and in need of a clean and lube now.

Take the Derya home, clean thoroughly of the nasty mineral oil lube the gun ships with, and use some Royal Purple 140 diff oil on the parts that move, except the actuator which gets pennzoil red synthetic Wheelbearing grease.

4 more boxes of fed target load, with only 1FTE.

Switching to my own AA Target loads 7/8oz using high brass grey hulls, 250 rounds and not one FTE.

Time to clean again, inspect, and then do some more break in time.

Tearing the gun down is easy, some clearances are tighter than my winchester auto, but I think the grease will work fine. If not, I will switch it all to Royal Purple.

So far, no undue wear, I can see some areas wearing in and bedding properly. So all looks good for a long term gun that will run reliably.

With that said, 250 more rounds will be fired this week to break in the gun, and then I will be more confident in the gun. Most auto loading shotguns need 500-1000 rounds for all clearances to be finalized, and properly broken in. Powder residue is the bane of autoloaders, and the Derya seems to run a little cleaner than my wingmaster.

That's all I can contribute so far


Edit: CAREFUL of the chokes.... make sure to clean them and get that nasty mineral oil off them and get a proper GREASE on the threads... otherwise the chokes will walk out on you. This is not a criticism but common sense to most people who run guns with remchokes.
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I suppose 250 target loads plus 3 boxes of slugs is a pretty good testament to the recoil properties of this gun...

How did you find the accuracy with slugs?
 
grimreefer said:
I suppose 250 target loads plus 3 boxes of slugs is a pretty good testament to the recoil properties of this gun...

How did you find the accuracy with slugs?
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Slug accuracy will be tested once proper sights arrive. While I appreciate the thoughtfulness of Derya adding every ilk of iron sight in their kit, the quality of the included sights is less than airsoft. But it DOES allow a person to find what combo they want to run for 3 gun, and then purchase a set of hq sights from Troy or whoever.

That being said, we were running slugs with the included sights, and they ran out of windage adjustment. but with same POA we kept a nice 4" group at 25m offhand. The amount of excess plastic 'flashing' inside the apeture made this a challenge.

So far, things are looking up for using this in 3 gun. The trigger I am hoping will smooth out in the next 500 rounds. If not, some massaging will be in order
 
Got Juice? said:
My 2 Derya MK12's arrived monday. Thanks to TandT Arms for their wicked fast shipping.

So, here is my experience. Gun comes in, go to CDN Tre, buy a case of trap loads, and some clays. Go to the range and blast off 6 boxes of Federal Target loads at the range, and 3 boxes of slugs. 3 FTE's on a gun not broken in, and in need of a clean and lube now.

Take the Derya home, clean thoroughly of the nasty mineral oil lube the gun ships with, and use some Royal Purple 140 diff oil on the parts that move, except the actuator which gets pennzoil red synthetic Wheelbearing grease.

4 more boxes of fed target load, with only 1FTE.

Switching to my own AA Target loads 7/8oz using high brass grey hulls, 250 rounds and not one FTE.

Time to clean again, inspect, and then do some more break in time.

Tearing the gun down is easy, some clearances are tighter than my winchester auto, but I think the grease will work fine. If not, I will switch it all to Royal Purple.

So far, no undue wear, I can see some areas wearing in and bedding properly. So all looks good for a long term gun that will run reliably.

With that said, 250 more rounds will be fired this week to break in the gun, and then I will be more confident in the gun. Most auto loading shotguns need 500-1000 rounds for all clearances to be finalized, and properly broken in. Powder residue is the bane of autoloaders, and the Derya seems to run a little cleaner than my wingmaster.

That's all I can contribute so far


Edit: CAREFUL of the chokes.... make sure to clean them and get that nasty mineral oil off them and get a proper GREASE on the threads... otherwise the chokes will walk out on you. This is not a criticism but common sense to most people who run guns with remchokes.
Click to expand...

Do you always run automotive lubricants in your firearms? Not saying it's wrong just wondering why not just use stuff from the gun store other than price.
I have just started using Lubriplate grease in my M14's applying it thinly with a small modeling paint brush so am wondering what other products would work well and be compatible with the polymers and coatings used and not get bunged up with powder residue. I've always used lubes from the LGS but don't like that it's $10 for a little syringe of grease when I could get a big tube for the same price.
I have a MK-12 in the mail on it's way to me right now, the talk of all the packing grease in them makes me wish I had an ultrasonic tub big enough to just throw all the parts in. Will get a full strip, clean and fresh lube before I take it out for some fun. I think this is going to get expensive, I'll have to keep my eyes open for sales on 12ga from now on. Last stuff I bought was $9/ box of 25 from Cabela's so I bought a case, Time to start going to Canadian Tire and Walmart for their 100 round box crap and watch for sales everywhere else :)
 
Automotive lubricants contain a fair amount of zinc which is a good shock buffer and combats wear quite well. The detergent packages are also superior in them which aids in cleaning residue. I am a huge fan of Lucas and RP's gun oil, but have found that they have superior products in automotive lines. And that Pennzoil red synth wheelbearing grease. Can't be beat for metal parts sliding against each other in high temps. It stays put and encapsulates contaminants without turning into glue. One tube of grease lasts me 2 years or better and a 1l bottle of RP diff lube lasts me4 years.

The Lucas and RP gun oils are great products, decently priced as well. I only wish they came in a larger qty bottle. I got tired of the piddly small amounts and running out.
 
Got Juice? said:
Automotive lubricants contain a fair amount of zinc which is a good shock buffer and combats wear quite well. The detergent packages are also superior in them which aids in cleaning residue. I am a huge fan of Lucas and RP's gun oil, but have found that they have superior products in automotive lines. And that Pennzoil red synth wheelbearing grease. Can't be beat for metal parts sliding against each other in high temps. It stays put and encapsulates contaminants without turning into glue. One tube of grease lasts me 2 years or better and a 1l bottle of RP diff lube lasts me4 years.

The Lucas and RP gun oils are great products, decently priced as well. I only wish they came in a larger qty bottle. I got tired of the piddly small amounts and running out.
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do you switch back to oil only in the winter? I used to use some red synth gun grease on my Kriss Vector till I started having stoppages in the colder months so switched back to oil.
 
Tracking shows my MK-12 in transit, anyone have recommendations for breaking it in? My Versa-max has shot everything perfectly from day one so I wasn't really expecting this one would need a break in but I've got lots of different 12ga to run so whatever it needs :ar15:
 
cr5 said:
Tracking shows my MK-12 in transit, anyone have recommendations for breaking it in? My Versa-max has shot everything perfectly from day one so I wasn't really expecting this one would need a break in but I've got lots of different 12ga to run so whatever it needs :ar15:
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remove from case. Check to make sure firearm is clear. It comes with factory lube. Buy a case of trap loads and have at it! Then clean and lubricate with your preferred lube, and do it all over again.

I am on case #2 and so far this case has had no fte's (although they are my home AA loads)

Looks like 500 rounds and the parts are starting to break in nicely. I would guess at 1000 this will be as reliable as my winchester autos
 
These mags are quite large and heavy...for those looking to run this in 3gun, have you given any thought to how you're going to grip them? ie "beercan" vs "index" For rifle mags I can go either way, but I think I will have to beercan these suckers.
 
Anyone done any experimenting with the chokes to see how these pattern? Are the ones that come with it steel shot friendly or should we stick to lead? Anyone find a cool extended breacher choke or something neat for them?
 
I just ordered the Carlson's rifled choke tube. I plan on doing some accuracy testing at 100y with Foster slugs (and maybe even some sabot) with and without the rifled choke when it arrives.
 
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