[Astronomy]

Rucking around with a long gun looking object is usually a recipe for public alarm and potential disaster during a police encounter. Unless you are on a military base where that kind of thing is routine. It was that way when I was training up for the SFQC decades ago. It still is. Apply common sense and understand your battle space.

Don't over-think things. KISS. Dewalt 42" (or bigger) bright yellow wrecking bar from Home Depot or Lowes. ~$20. They weigh 7+ lbs. You'll look like someone carrying a very visible big yellow crow bar while working out... not an armed madman.

You don't need any "practice" with a pistol grip, sling, etc. while rucking. Nor do you need camouflage effects, simulated accessories, or anything else. You just need to saddle up the ruck, pick up the steel bar, and fucking move out smartly.

It's a PT event, not a tactical patrol.