Years back, Sportsmans Guide had a deal on genuine HK21A flare guns. As I recall, they were something like thirtyfive bucks or so and I bought a few. At the time there was a goodly amount of 26.5mm Czech flares on the market (26mm will work also). I wound up with quite a variety of projectiles and smoke. Hey, why not? They were cheap(ish) and definitely fun to play with.
Practical? Mmmmm….not sure. But..here’s where they shine – 26.5mm flares are far more…substantial..for your perimeter tripflare warning systems than those rinkydink 12 ga. Olin flares. A quick trip through the plumbing section of Home Depot gets you pretty much everything you need to build a tripflare warning system.
For the more DIY minded, I recall reading a how-to somewhere on the internet about nailing a rat trap to stake, and then attaching the pull chain off some of those Skyblazer flares to the trap bar. Set the trap, it gets triggered, bar snaps down pulling the chain and igniting the flare. Clever.
Of course, thinking about that sort of thing led me down the rabbit hole to how to make other perimeter warning devices using mousetraps. Interesting stuff.
Remember: primers are dangerous and they might ignite things you didn’t want to ignite that were in close proximity to them. So..be careful. Wink, wink, nudge, nudge.