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Hello whisper community
I am a swiss user that bought many years ago a complete .300 whisper-AR15 upper. This is my first post and i want to anticipate my apology for my horrible english language knowledge.
I have a DSC upper assemby with 16"-barrel and gas port in carbine position. I shot only one time or tried to do so with the only available ammunition 220 grains RUAG Swiss P in combination with a Bruegger&Thomet silencer. The bolt carrier was not capable to eject the spent case and opened only just to half of its opening way.
The lower has a buffer and recoil spring of a factory 16"-Bushmaster XM15-E2S.
I don't no the dimensions of barrel gas port and the size of the gas port at the front sight. But i red on this forum that the best size with carbine position gas tube is .125?!?!
Do you have any proposition what i can do to make my upper functioning with the 220 grains?
Thank you anticipate for your competent answers.
Best regards, libertyswiss.
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