06-19-2014, 02:58 AM
Are you set on JP? Several forums members here have had great experiences with the SLR adjustable gas block and it's low profile should fit under the KMR. They have good dimensions on their site that should help too.
http://slrrifleworks.com/index.php?route...uct_id=124
http://slrrifleworks.com/index.php?route...uct_id=124

