I'm trying to google what happens if you shot a gun to other firearm and found no result

[juji]

its common sense elz, when you have a projectile enter a case of bullets that forms the tips the only casings you will affect are the ones you hit directly, this will drive the tips backwards into the casings and create the required PSI to detonate the primers. any other explosions are caused by the brass deforming due to a lack of a barrel and exponential damage

If an incendary bullet penetrates over magazine would cause explosion spreading bullets to any direction like fragmentation grenade, this is very possible, I'm not sure about standard bullet.

[cody lundin]

If an incendary bullet penetrates over magazine would cause explosion spreading bullets to any direction like fragmentation grenade, this is very possible, I'm not sure about standard bullet.

no, a phosphorous tracer round would cause a few more accidental discharges bit if you want a full discharge youll need to land dead on accurate with an RPG