A receiver thread protector for your Silverback Airsoft SRS. This one has the 24mm threads should you wish to directly attach one of the SBA suppressors.
NOTE: Will not work with the Silverback gspec outer barrel. Will only work with the short outer barrel base found here....
https://www.shapeways.com/product/NNJQQ8Z64/srs-outer-barrel-base?optionId=96105294