These handguards and all of Magpul's AR handguards are meant specifically for AR-15 small frame rifles. It may fit your DPMS LR-308, but it may require some fitting as its meant for a smaller rifle.
Yes, these are cut to allow for piston systems, including the Adams Arms one.
Yes, the Magpul Industries MOE SL Carbine Length AR-15/M4 M-LOK Handguard will fit and function as intended with the Delton DT Sport (Mod 2) AR15 rifle.
The Magpul Industries MOE SL Carbine Length AR-15/M4 M-LOK Handguard will not work with the Savage Patrol. This Magpul Industries MOE SL Carbine Length AR-15/M4 M-LOK Handguard fits carbine length gas systems and the Savage Patrol has a midlength gas system. You will need the model at the link below.
https://www.opticsplanet.com/magpul-industries-moe-slim-line-handguard-w-m-lok-slots-for-ar15-m4.html
The Magpul Industries MOE SL Carbine Length AR-15/M4 M-LOK Handguard is compatible with carbine length gas systems with the following specifications. The MOE SL Hand Guard - Carbine-Length is a direct replacement for M4 Carbine-type plastic, two-piece hand guards and utilizes the existing round front hand guard retaining cap and rear spring-loaded delta ring. Not compatible with piston operated AR platforms.
Yes it will line up, will be like pic 12 in the images.
No it does not come with a sling attachment piece.
These hanguards are designed to incorporate the A2 front sight.
No it will not. You will need the MAG424.
Yes, the length will fit just fine.