Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to maintain an m249 saw [title] Clear the firearm. [step] On fire mode, with your palm up, pull the cocking handle to the back and lock the bolt into place [title] Place your weapon back to safe mode. [title] Hold the charging handle, and then open the tray cover.

Ending1: [title] Remove the ammunition belt from the feed tray. [title] Check the feed pawl assembly under the cover, and the feed tray assembly. Ending2: [title] Raise the bolt close to the chamber (this prevents the threat of fire from reaching the strike point). [step] Slide out the pistol and set it aside. Ending3: [title] Place your vehicle on a safe, relatively flat spot like a bike or sidewalk. [title] Slide the rear of the gun on the bike over the gear shift and back-up gear. Ending4: [title] Insert the phillips head screwdriver into the back, and turn it counterclockwise. [step] Once it's in, use your wrist to gently twist the prongs and release the screw.

Answer format: ending1/ending2/ending3/ending4