Are these spacers?

[TonyAT4]

Bought my 21 AT4 used; are these spacers that someone added or is this stock? Thanks.

 

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VIAIR 400P/40045 Automatic Portable Compressor 150 PSI/2.30 CFM - Grab one through Amazon!

[Duramaximus]

Stock.

 

[TonyAT4]

Thanks