Quarterbore's Forums - 300Whisper in the AR-15

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- - 300Whisper in the AR-15 (http://www.quarterbore.net/forums/showthread.php?t=3536)

Thnx robrob for that info. yeah a tip o the hat to M1S for also threading their bbls 5/8 x 24 tpi also which I believe is a standard for .308. I have read in the past they did not do this. I don't have tip on how to disassemble your buffer tube, I have never done this, maybe it is epoxied on there also? Will you need to put something in there as a spacer to fill the void of the removed weight?

Hey ROBROB have you tried vise grips to remove the buffer pad. That works for me.

I'll give the Vicegrips a try on the buffer tip. I'm going to go with corncob media to fill the void created by removing the weight. Someone on this forum used it and I've got lots of it available.

Quote:

Originally Posted by robrob (Post 24855)

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

I used a small screw driver and slipped it in between the tip and buffer body. It's on there very tight but it does come off.

I haven't lightened the carbine buffer yet but cutting off about 3 coils from the carbine buffer spring allows reliable function with 220gr subsonics, both Hornady round nose and Sierra SMKs. It will lock the bolt open with an empty magazine every time and feeding has been perfect.