not bowhunting...i know i know...
but ive had rifle scopes fail..and fiber optic sights come loose on the flintlock. i really really hate to admit ive lost 2 deer with the rifle and completely missed one..all in one season. all within 50yds. this was after i already had like 5 under my belt and i knew it wasnt me. that summer dad was settin up a slug gun. i told him to take my scope so he didnt have to buy one coz i quit hunting. he tried talkin me out of it...but did take the scope...took it to the shop to be mounted and bore sighted...the guy couldnt believe how jacked up the scope was. the crosshairs moved ALOT every time you adjusted the power of the scope!!! i was jacked to say the least. none of the deer seemed fatally hit and we hunted the areas alot and never found them...hope they made it...
then another season i missed a pile of chip shots with the flintlock. i practice with my flintlock religiously..its close up there with bow shooting...you dont shoot it alot your not going to shoot accurately..dont have to shot as often as a bow but you gotta keep in practice...and i do and always have..i couldnt figure it out. i was gettin ready to throw the flintlock in the lake...target shooting after a few misses i couldnt hit jack...then i finally noticed the sight was WAY loose when i was cleaning it!!
i guess i had a tree stand failure..kinda..mainly my fault...rifle hunting opening day...i stood up when i saw a GIANT buck and another buck...leaned on the front rail of my summit viper to steady me...somehow i forgot to put on the strap for the top of the stand...i think it fell and i didnt feel like goin to get it

well needless to say that top portion of my stand fell down. the bucks never took off...but they kept walking...wouldnt even stop to grunt calls or me yelling...i never got a shot....some snot nosed kid hunting the next farm over with his buddy killed the monster the first saturday[:@] man was it a whopper to say the least

....not exzactly a equiptment failure...just plain stupidity on my half...plus the saftey factor....i about fell out with a loaded rifle in my hands...think the saftey was off too

them 2 bucks walked around my stand all morning before daylight grunting..thats why i didnt go get that strap i dropped now that i think about it[:'(]