It must take real effort to be this stupid. It’s almost like you channeled information from the wiki link you didn’t click on (or simply unconsciously remembered hearing about it early on in the war) and drew the exact wrong conclusion. See, Ukraine did/does 3D print lightweight fins to add onto the RKG-3 anti-tank grenade. Only they’re additions to stabilize it while falling, they didn’t remove any ‘unneeded parts’. Why? See, designers of munitions aren’t in the habit of adding parts on them that are unnecessary just for the hell of it. If it’s there, it has a purpose, numb nuts. From the link you didn’t read:
The grenade has also been seen in use by the Aerorozvidka unit of the Ukrainian military in the 2022 Russian Invasion of Ukraine. PJSC Mayak modifies the grenade[5] into the RKG 1600 by changing the fuze timing and adding 3D printed fins to stabilise its trajectory when dropped from a commercial drone.[6] Footage of these being used by Ukrainian forces against Russian forces has been published officially.[7][8] The estimated total cost is “less than $100”.[9]
And hey, look at that. They even changed the fuze timing. Which you clearly don’t understand the purpose of either if you think the fuze causes the grenade to detonate after a fixed amount of time has passed. See, the fuze arming just arms the grenade. Again from the link you didn’t read and instead just decided grenades have an ‘arming pin with associated hardware’:
The fuze in the handle activates the grenade. When the parachute deploys, its ejection throws a weight to the rear of the handle and disables the safety. When it impacts or stops, inertia causes the weight to fly forward and hit the spring-loaded firing pin, which activates the primer detonator in the base. This sets off the booster charge in the base of the shaped charge, detonating and enhancing the main charge. The sensitive fuze guarantees that the grenade will detonate if it impacts any target.
Oh and finally, since you ‘know’ grenades are fragmentation weapons, you clearly don’t understand how an anti-tank grenade works. See, when I said they’re designed to blow a hole through steel plate, I made the mistake of imagining you were smart enough to know that isn’t something you achieve via fragmentation. Fragmentation doesn’t punch a nice clean hole in armor plate dumbass. A shaped charge does that. This is getting tiresome, but again from the link you didn’t read:
Armour penetration depends on the model. The original RKG-3 used a basic shaped charge with a steel liner and could penetrate 125 millimetres (5 in) against Rolled Homogeneous Armor (RHA). The RKG-3M used a copper-lined shaped-charge warhead and had a penetration of 165 mm; the RKG-3T had an improved copper liner that had a penetration of 170 mm. The RKG-3EM has a larger warhead and boasts a penetration of 220 millimetres (8.7 in).