[New here from Ohio]

DVC Limited 40 for USPSA

DVC Limited 9 in 3 gun

MPX carbine in both

JP GMR 13 PCC in both

2A Armament build for AR 15 in 3 gun

Beretta 1301 shotgun for Practical 3 gun

MKA 1919 shotgun is latest addition to play in unlimited 3 gun.

Still figuring out what to do about an open pistol for unlimited 3 gun.

[Sig MPX Parts Identification]

The ones marked with an 8 are aftermarket blocks from In Lead We Trust.  They are a company that makes barrels for the MPX.  Note the ILWT markings on the barrel in your pic.

[Installing Odin Mag Release on JP]

Sorry I was late to the post for warning you about the spring relief area.  I saw that when doing mine.  Placed it here to avoid the issue and to make sure I had thick enough area for good threads.

[Hiperfire - anti-walk pins and ambi safety]

I use a Hiperfire ECL, KNS pins and BAD ambi safety.  This JP was built from components rather than a complete rifle.

[MPX receiver fit???]

As mentioned, there is a tension adjustment screw.  You have to remove the grip to access it.  That screw has a spring loaded contact point that meets the take-down lug.  I have found that the best point of adjustment is as far as you can take it without taking out off of the spring load in it.   Yes, it will be difficult to push out the take-down pin with this amount of tension, but since it is spring loaded, you can press the upper and lower together to make pushing out the take-down pin much easier.  I use a plastic chamber flag in my MPX.  It also works well as a take-down pin punch, which helps too.  Put some blue loctite on the adjustment screw to keep it where you want it.

[Extended Mag Release for JP 9]

I attached the tab part of an Odin Works XMR2

[JP rifles gmr-15 magazine release options]

I drilled and tapped the release on my GMR 13 and then atteched an Odin Works XMR2.  The screws are 4-40 if you don't mind drilling into your release.  This has worked very well for me.  

[New here from Ohio]

Hello from Columbus, OH.  After 3 years of shooting competitively, I've finally made my way into the Enos forums.  I shoot Limited and PCC in USPSA and Practical and PCC in 3 gun.  Also, looking to play around in unlimited in 3 gun.  Looking forward to contributing to the forums where I can.