The weight is 4.55oz.
Yes, there are models of the JP Enterprises 3 Port Barrel Compensators that will work for a rifle chambered in 7.62x51mm. The following models of the JP Enterprises 3 Port Barrel Compensator will for for that rifle. Model Numbers: JPTRE3-324B, JPTRE3-324S, and JPTRE3-324TI. All three of those will work for your rifle.
It is possible, but I would contact the manufacture for confirmation.
I would recommend contacting the manufacture.
JP does not specify the weight, please contact them directly for further assistance.
The 1/2x28 threaded models are for .224 caliber rounds or smaller, the 5/8x24 threaded models are for .308 caliber rounds or smaller, and the 1/2x36 model is intended for .355 caliber (9mm) rounds or smaller.
The overall length is approximately 3".
It is possible however it may mar the finish of your muzzle device.
It will completely depend on what caliber your rifle is chambered in as well as the thread pitch of your muzzle. Please email us at techsales@opticsplanet.com for further assistance.
Any of the 5/8x24 threaded options on this page will work.