This MAGPUL MAGLINK Magazine Coupler is for standard 30/40 round magazines. This piece is missing the two hardware screws but overall this piece is in good condition. Bidders are welcome to preview items in person during our normal operating hours Tuesday through Saturday 11am-6pm. Estimated shipping parcel size (LxWxH) 6 inches x 6 inches x 6 inches. Please note, shipping estimates are provided for LiveShipping calculations only and may vary based on weight and location. The auction house will combine multiple lots to reduce shipping cost. Please inform the auction house prior to paying your invoice for special shipping requests. Our primary method of shipping is via UPS Ground.