[Thoughts on Potential JP GMR15 Build]

The M-Lok handguard is 2.0 oz lighter than the MKIII Rapid Configuration handguard, so there is a benefit in weight, but not dramatic.  Another advantage is that attachments will be cheaper.  The thermal dissipator won't fit under the M-Lok, but that should be a moot point. 

[Thoughts on Potential JP GMR15 Build]

Thanks for the feedback.  I'll scratch off the thermal dissipator and the roller trigger.  Now I have a question about the hand guard.  I was planning to get the standard rapid configuration handguard, but it appears JP recently made an M-Lok handguard available.  What is the consensus on the rapid configuration handguard?

 

I originally began considering the CZ Scorpion and then decided to move on to the GMR15 once I realized I would likely make quite a few changes to the Scorpion.  I am looking for something that is reliable and shoots well out of the box and the GMR15 seems to fit the bill based on what I've read.

[Thoughts on Potential JP GMR15 Build]

I am considering my first PCC and have mostly settled on the GMR15 after conducting research.  I have played around with the configurator and am hoping those experienced with the platform have some feedback regarding some of the options I am unsure about.

 

Thermal dissipator: Based on my searches, there seems to be a roughly 60/40 no/yes split on this option.  Obviously, the main downside is the additional 5 oz of weight added around the barrel to a gun that is already front heavy.  Under what conditions would the increased cooling become noticeable?  I am located in TX, so I would be shooting in hot temperatures for ~1/3 of the year.

 

Trigger: Roller trigger or flat trigger?  I generally like flat triggers and have no experience with a roller trigger.  I understand the potential benefit of the roller trigger, but I wonder whether the constant lateral movement along the trigger could be distracting, even if it doesn't cause shots to be pushed laterally.  Anyone with the roller trigger regret it?

 

Trigger spring:  Any reason not to go with the yellow 3 - 3.5 lb springs?

 

SCS: I'm looking at the short stroke SCS with the two tungsten and three steel weights, which is the mid weight option.  I shoot factory ammo, generally 124 gr, though also some 147 gr.