Decided to go with silencerco parts instead so my loss your gain.
The SDTA adapter is new never used, it is the steel version.
The griffen brake was on my bolt action for 10 rounds, has some rocksett on back side but otherwise like new. 5/8x24
$105 shipped for both or send me a fair offer if you want one or the other.
USPS money order or discrete paypal +3% unless using a non fee source.