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How did it work during the course?
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You guys are quick! Sorry to keep y'all on the edge of your seats.
The cover worked great for the course. I ran the can the whole time. Pat MacNamara, as with any reputable instructor, focused on accountability and value from every round fired. No spendex or "ballistic masturbation" involved. I'd say the highest rates of fire within a short period of time encountered during the course would be 20 rounds within about 30 seconds (5 standing, 5 kneeling, 5 sitting, 5 prone) with two sets of those within 5 minutes or so. We also did a number of sets of 5-5-5 with 5 shots, reload, 5 shots, reload 5 shots. That's probably 15 rounds within 20 seconds or so, and we did a couple sets of those in 5-10 minutes.
The cover shows signs of heat (discoloration on the inside of the heat liner) but no change in texture. The outer cover looks exactly like an identical outer cover that was not subjected to high heat yet. At its peak the cover got warm enough that it was uncomfortable to grab for more than a few seconds with bare hands. The metal buckles got VERY hot though and I quickly learned to pay attention to where they were before using my hand warmer (ambient temps were 40's and maybe low 50's).
There is no discoloration or residue on the can at all.
The cover stayed very secure in position and did not shift position on the can at all. Really, not one bit. I pulled the straps VERY tight (using the pliers on my leatherman) to secure it.
The Rugged Surge also stayed very secure -- thanks to the locking ring at the bottom I was very confident in the attachment and never found the can loose either day. I need to shift the cover forward a bit to access the locking ring (which I can do even with the straps tight) and of course wait for that sucker to cool down before removing the can for storage.
Obligatory gear pic
Discoloration inside cover (the black color is as-received, the heat shielding is white and Cole-Tac colors the ends black to blend better with can and cover)
Comparison with new cover (new is tall, short was on the Surge)