Image 1 of 5 Image 2 of 5 Image 3 of 5 Image 4 of 5 Image 5 of 5 1:87 BCR_Slug $30.00 3d printed drop-in Atlas yellow box BCR 400 series slug shell. A frame modification is required (see pictures). Quantity: Add To Cart Added! 3d printed drop-in Atlas yellow box BCR 400 series slug shell. A frame modification is required (see pictures).