Quick view Add to Wishlist Forensics Source 1353359 SwabTek Gunshot Residue Test Kit SwabTek's Gunshot Residue (GSR) Test Kit is designed to presumptively test for the presence of GSR. The test kit screens for the inorganic constituents of GSR, the metallic fragments left as residual following discharge of a firearm. The test kit can be... MSRP: $833.11 Add to Cart The item has been added Compare