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I have a standard 16" Model1Sales 300 Fireball carbine upper with the carbine position gas port. I removed the 4 rail gas block to drill out the port and block and found that they were already 1/8" (.125"). I installed an adjustable gas tube and had to trim the buffer spring a few coils to get it to cycle the Corbon 300 Whisper ammo. It has no problems cycling with 220SMKs and 10.5grs of AA1680. I have to give the M1S upper two thumbs up.
I shortened the spring because I couldn't get the buffer's cushion tip off. I removed its roll pin but could not pull the tip off to get to the weights. I could twist it with a pair of pliers but not pull it out. Any tips?
Rob
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