Fasthenk65 Posted October 13, 2019 Share Posted October 13, 2019 Finally my 14,5 " JP15-GMR arrived. Will run it with the Holosun 510c dot and now looking for fastest sight recovery. Was recommended the MBX Buffer Recoil Reduction system for PCC. Any comments?? TNX! Link to comment
Fasthenk65 Posted October 13, 2019 Author Share Posted October 13, 2019 Just now, Fasthenk65 said: Finally my 14,5 " JP15-GMR arrived. Will run it with the Holosun 510c dot and now looking for fastest sight recovery. Was recommended the MBX Buffer Recoil Reduction system for PCC. Any comments?? TNX! Will be shooting 115 grain FMJ's with slow powder (VV N350) Link to comment
Bwillis Posted October 13, 2019 Share Posted October 13, 2019 (edited) Blue buffer spring with the buffer in the 2nd hole making the buffer short. Pair with a yellow sprinco for the main spring. Then test the mbx short stroke spacers and match the one that reliably resets your trigger. also run the buffer wet it likes oil. I also recommend taking the buffer retaining detent out. First it gets in the way, second Ive seen the detent break and lock a trigger up mid stage. Edited October 13, 2019 by Bwillis Link to comment
John1969 Posted October 13, 2019 Share Posted October 13, 2019 Hallo Henk, Also bought a JP GMR 15, same store i assume. Buffer detent was already out. If you buy the MBX buffer it comes with a yellow carbine spring, don't know if it's a Sprinco. You also need to buy the MBX tuning kit. Shot it yesterday with a blue spring and short buffer. Ammo used was Fiocchi 115gr factory ammo. Trigger reset was reliable, also activated the lrbho. Need to try more setups with this ammo. If you want it to short stroke (i don't) you can also use euro's in the buffer tube. Met vriendelijke groet, John Link to comment
Fasthenk65 Posted October 13, 2019 Author Share Posted October 13, 2019 15 minutes ago, John1969 said: Hallo Henk, Also bought a JP GMR 15, same store i assume. Buffer detent was already out. If you buy the MBX buffer it comes with a yellow carbine spring, don't know if it's a Sprinco. You also need to buy the MBX tuning kit. Shot it yesterday with a blue spring and short buffer. Ammo used was Fiocchi 115gr factory ammo. Trigger reset was reliable, also activated the lrbho. Need to try more setups with this ammo. If you want it to short stroke (i don't) you can also use euro's in the buffer tube. Met vriendelijke groet, John Patrick's store? Link to comment
John1969 Posted October 13, 2019 Share Posted October 13, 2019 (edited) Yes, Patrick's store. He also has JP the extended magazine release in stock. (in different colours) Bought the MBX buffer system and tuningkit at "vanmulekom". Edited October 13, 2019 by John1969 wrong translation Link to comment
Fasthenk65 Posted October 13, 2019 Author Share Posted October 13, 2019 1 hour ago, John1969 said: Yes, Patrick's store. He also has JP the extended magazine release in stock. (in different colours) Bought the MBX buffer system and tuningkit at "vanmulekom". I will to... let's see if we can make the JP sing and do as good as the Sig MPX PCC... Link to comment
egd5 Posted October 13, 2019 Share Posted October 13, 2019 I'm not sure I understand. Have you shot it as is from JP and don't like it? Is it not performing as well as your MPX? It sounds like you are changing it just because you think it can be better. But maybe I'm wrong, just asking. Link to comment
jualdeaux Posted October 14, 2019 Share Posted October 14, 2019 I was also wondering why you were going with the MBX in a JP. What is wrong with the JP? Link to comment
Ner Posted October 14, 2019 Share Posted October 14, 2019 (edited) Any help plzplz ? I'm a midway in tuning my MBX buffer + their yellow combo spring Shooting factory 124 Sellier&Bellot / 124 STV Scorpio Gun is 12.5" ADC 9, blowback And i can't tune it properly ! ____ Blue inner spring with second hole (short) + BCG weight removed = Double Feed + FTEject + funny fullauto mode (It's was not funny for a RO) Blue inner spring with first hole (long) = Double Feed + FTEject ____ Green inner spring with first hole (long) = seems ok, But FTEject 1/100 rounds ____ Red inner spring (long) = Ok, but heavy dot movement to 2 o'clock doubletapping (6 inch from 20 yards) Red inner spring (short) + 2 coins buffer = Better (faster), but still dot movement to 3 o'clock doubletapping (5 inch from 20 yards) any ideas, what can i try to make movement flatter? Edited October 14, 2019 by Ner Link to comment
Fasthenk65 Posted October 14, 2019 Author Share Posted October 14, 2019 18 hours ago, egd5 said: I'm not sure I understand. Have you shot it as is from JP and don't like it? Is it not performing as well as your MPX? It sounds like you are changing it just because you think it can be better. But maybe I'm wrong, just asking. Will shoot it standard first as it comes from tomorrow. Only had 2 experienced PCC guys explain to me that the MBX system works wonders in the JP? So here to check that route out. Link to comment
egd5 Posted October 14, 2019 Share Posted October 14, 2019 OK, just wondering why. But remember, things that make a difference to top level shooters usually don't mean that much to average guys like me. That 1/100th of a sec. doesn't mean much when we waste 5 seconds cause we move slow or forget our plan half way through. Link to comment
Darqusoull13 Posted October 14, 2019 Share Posted October 14, 2019 1 hour ago, Fasthenk65 said: Will shoot it standard first as it comes from tomorrow. Only had 2 experienced PCC guys explain to me that the MBX system works wonders in the JP? So here to check that route out. Shoot it as you got it for a couple of months. Once you have an idea of how the rifle performs re-evaluate if you need to change parts or just shoot more. Link to comment
Fasthenk65 Posted October 14, 2019 Author Share Posted October 14, 2019 4 hours ago, Darqusoull13 said: Shoot it as you got it for a couple of months. Once you have an idea of how the rifle performs re-evaluate if you need to change parts or just shoot more. agree. do have quite some experience though with MPX PCC .. this is my benchmark.. Link to comment
Mad85CH Posted October 27, 2019 Share Posted October 27, 2019 Just a little video for you guys, that might think of using the MBX buffer in your GMR-15... I am really impressed.... hell of a difference between the JPSCS2-9MM and the MBX. Maybe the JPSCS2-9SS-5H5 might be better... don't know. But i tell you... after 5000 rounds or a little bit more you have to change these o-rubber rings.... this kinda sucks... in the MBX you will fire 10000 of rounds before you even have to change the spring... and after all it will be just a spring and not a bunch of rubber rings...just my opinion. But like Cobb said... it all depends on your loads.... its a very tunable system! https://www.youtube.com/watch?v=Uwc3-f4qS4k Link to comment
Shadow Posted October 28, 2019 Share Posted October 28, 2019 "But i tell you... after 5000 rounds or a little bit more you have to change these o-rubber rings.... " Not my experience. Over 10,000 rds and the O-rings look fine. Link to comment
ck1 Posted October 28, 2019 Share Posted October 28, 2019 (edited) On 10/14/2019 at 6:41 PM, Fasthenk65 said: agree. do have quite some experience though with MPX PCC .. this is my benchmark.. I don’t think you can really get a blowback gun to cycle like and shoot as soft as an MPX, they’re just different animals in how they work, but I do think you can tune your dot bounce to where you like it if you play around enough and there’s certainly more variation to try different combinations over what the MPX system gives... the 5 tungsten short-stroke SCS is nearly as soft but the dot seems slower to recover, so you’ve kinda gotta find what is soft+fast with your load spring/weight wise... IMHO the dot bounce with the MPX has more to do with stock length, optic height, and good gun fit, as the buffer system stuff is already kinda one-size-fits-all soft as you’d ever bother and tied to your load. I’d work backwards from heavy to lighter, going 5 tungsten, play with springs, and maybe work lighter changing out steel for tungsten from there if you’re looking for softer shooting like an MPX, but it’s really about how fast you can shoot that second shot, so don’t be surprised if you end up liking a snappier gun, the systems are just different... the MBX buffer system set-up looks like something you’d explore beyond that... Edited October 28, 2019 by ck1 Link to comment
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