SHOT Show 2015 Pictures (From SMGLee)

**nml** · 03-04-13, 00:41

Thanks TRIDENT. 2.2 oz diff between the steel and aluminum barrel nuts so should let everyone compare apples to apples.

**smac61** · 03-07-13, 13:42

Does anyone know if a vltor clamp on gas block will fit inside the MK1?

**montrala** · 03-07-13, 14:26

Yesterday I shot my HK with 14.5" MK4 rail in HK version on it... then I wake up all in cold sweat

Well, getting HK MK1 must suffice for now

**ALCOAR** · 03-08-13, 02:16

Heat dissipation testing: SMR barrel nuts Aluminum vs. Steel

Just a bit of testing I wanted to do in order to satisfy my own curiosities, and while this testing has satisfied my own curiosity, it shouldn't be taken as anything official, or from GA.

Setup:

A fixed positioned butane torch applied a continuous, controlled flame amount directly to the barrel nut from exactly .5" away for a total of exactly 10 seconds.

Immediately after 10 seconds of direct flame contact had expired a digital IR thermometer took a reading at a controlled/fixed position directly above the point of flame contact, and then took a second reading after 20 seconds had expired (or when it read 30 seconds on the timer)

Initial temp readings of the barrel nuts were monitored over a 10 second period and the two readings listed for each reflect the highest/lowest temp readings during that time interval.

Results:

LW barrel nut:

Starting temps (high/low over 10sec. interval): 62.6 / 63.2 F

Reading @ 10sec mark: 142.9 F

Reading @ 30sec mark (20 sec w/o heat): 123.7 F

_____________________________________________

Steel barrel nut:

Starting temps (high/low over 10sec. interval): 61.9 / 63.2 F

Reading @ 10sec mark: 114.4 F

Reading @ 30sec mark (20 sec w/o heat): 103.9 F

Concluding thoughts....

The data very much confirms what science has already proven, and told us in the past in regards to materials, mass, and the property of heat dissipation.

The heavier Steel barrel nut resisted the heat much more effectively, thus keeping it's temp lower for longer, yet once heated....it retained that heat for a longer period of time than the comparable lighter aluminum barrel nut.

The LW barrel nut heated up significantly higher/faster than the steel barrel nut, yet shed that heat at a faster rate than the steel barrel nut.

**RXM** · 03-08-13, 06:17

The numbers for the 30 sec. w/o heat may be inverted since it looks like the steel barrel nut cooled down quicker than the LW aluminum barrel nut.

**markm** · 03-08-13, 06:44

Quit playing with your nuts.

**mtdawg169** · 03-08-13, 10:05

Originally Posted by RXM

The numbers for the 30 sec. w/o heat may be inverted since it looks like the steel barrel nut cooled down quicker than the LW aluminum barrel nut.

You have to look at the difference between the high / low temps. The steel nut shed 10° in 20 seconds while the aluminum nut shed approximately 20° over the same period of time. The steel nut "high" temp never even reached the aluminum nuts "low" temp. Not sure if any of this is significant, but interesting nonetheless.

**RXM** · 03-08-13, 10:10

Originally Posted by mtdawg169

You have to look at the difference between the high / low temps. The steel nut shed 10° in 20 seconds while the aluminum nut shed approximately 20° over the same period of time. The steel nut "high" temp never even reached the aluminum nuts "low" temp. Not sure if any of this is significant, but interesting nonetheless.

I'll eat crow