My KISS rifles.
At top : M1A-A1 ( This one left the factory sporting GI M14 parts in all the right places. The bbl is the factory 18in non chrome lined 1/11 twist)
At bottom: My M14S Tanker (GI M14/SEI/Sadlak parts with a Criterion 18.5in chrome lined std contour tube)
I use them for everything a centerfire rifle can be used for. ( General target shooting, matches, hunting, security, etc...etc.....
Simple to maintain, lock n load, shoot, and reload. The location of the safety in relation to the op-rod handle and mag release makes it one of the most KISS friendly rifles to point and shoot something with...... especially due to how well balanced it is.....and from any shooting position.
The sling itself is very simple, easy to adjust as a shooting aid, and is also capable of supporting the weight of the loaded rifle off the shoulder when I am in need of both hands for other work.
Anything within my effective range worth shooting can expect to be ventilated with one or more 30 caliber bullets, regardless of if they are behind a tree or not.
For me at least, KISS = proficiency through repetitive use. Since the rifle is semiautomatic, there is no need to manipulate a bolt or lever between shots....... thus very simple to acquire the next target as this is all I need to focus on.