CARB cleaner!
Got 3 in the past

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Be sure to use ONLY non-chlorinated carb cleaner

 

Without disassembling the stock you could submerse the butt end of the stock in some mineral spirits and try to wash the sand and debris from the stock, then blow off the stock if you have access to compressed air. Usually any hardware store should have odorless mineral spirits. The mineral spirits should not affect the finish on the stock.
If you wanted to go the disassembly route, it looks like you have the newer version of a3 stocks.
The A3 stocks with the plastic end cap are a lot harder to reassemble.

 

Without disassembling the stock you could submerse the butt end of the stock in some mineral spirits and try to wash the sand and debris from the stock, then blow off the stock if you have access to compressed air. Usually any hardware store should have odorless mineral spirits. The mineral spirits should not affect the finish on the stock.

Too much work & plastic & rubber parts will hate it

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Just tried pressured water and air, it helped a little but there is still some that feels deep within, anyone know how to take one apart to clean it?

 

$2 can of Walmart CARB cleaner!

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You could send it to James @Marine0303 (Teufelshund Tactical- a vendor below) for a "proper" disassembly, cleaning, and reassembly, as he has the knowledge (and tools) to professionally perform the work!!! :wink:

Tony