Armasight used to make one (discontinued even longer than the radius) for $2,400 ... and you might be able to find one for under $2,000 ... but they are far more rare than the radius.
Newcon Optik makes one for around $3k and the RAPTAR ES street price is $3k.
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As to use with the Mk3 60mm ... it can be done ... here's my current setup.
But the mk3 has no rail to mount LRF to the thermal, so you mount it on a rail on the side.
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Process I used to zero radius to the mk3 60mm:
01 - Setup 5.56(10.3) on RRS tripod
02 - Setup 7.62(22) on Manfrotto tripod just to the right of the 5.56(10.3)
03 - Aim reticle of mk3 60mm on 5.56(10.3) at center of mineral feeder at 415yds.
04 - With PVS-14 on rear of NF scope, aim center of 7.62(22) reticle at the mineral feeder.
05 - Turn on the radius aiming laser.
06 - Adjust the radius aiming laser so it is pointed at the mineral feeder, use helmet mounted 14 to get into the ball park.
07 - Keep checking the 5.56(10.3) to make sure the center of the thermal reticle is aimed at the center of the mineral feeder.
08 - Fine tune the Radius on the 5.56(10.3) by checking on the 7.62(22) with the 14 behind.
09 - Once the Radius on the 5.56(10.3) is zeroed, test several known distance targets. Aim the 5.56(10.3) thermal reticle at the target and check the range. Repeat steps 07, 08 and 09 if needed
I zeroed the radius to the mk3 60mm as shown above last Nov and it is still dead on. Routinely range to 3,000+ yds at night.