Magloc 2 pcs GEN4 Recoil Assembly Adapter Ring Black Description Gen 3 to Gen 4 Glock Recoil Assembly Adapter Ring - Black color This adapter allows you to use Gen 3 recoil spring assembly onto Gen 4 Glocks. Specification: Made of carbon steel. Weight: 0.05 oz (1.4 gram) Installation: (you can search on youtube: Glock adapter ring ) Warning - always wear eye protection if assembly or disassembly of firearms is required. If you are not comfortable with the installation procedures described below, please have the work done by a qualified gunsmith. Make sure the gun is unloaded before installation begins 1. Separate the slide form the frame according to your Glock manual. 2. Take out your Glock Gen 4 recoil spring assembly. 3. Slide this Glock adapter ring into the slide hole with the small end facing forward. 4. Use the standard installation procedures to install the Gen 3 recoil spring assembly to the Gen 4 slide. 5. Reinstall the slide back to the frame. 6. Test fire your Glock with the types of ammunition that you are using and making sure it functions as expected. Features: 2 pieces GEN4 Recoil Assembly Adapter Ring Black Product Details: Shipping Weight: 0.8 ounces#930 in Gunsmithing Tools Payment We accept Paypal payments only. Sales tax may be applied to your purchase as we possess sales tax certificates for all states we collect sales tax in. If your state is one that we charge sales tax in, you will see the sales tax charge at time of checkout before you submit payment. Delivery Expedited shipping is free. Handling time on our orders is normally between 1-2 business days. Your order should reach you within 1-3 business days. We do not ship to AK, HI, PO boxes, or APO addresses. We're not responsible for any incorrect or undeliverable addresses. We only ship to the confirmed Paypal address. We don't accept requests to change shipping addresses post purchase. We do not ship to AK, HI, PO boxes, or APO addresses. We are not responsible for any incorrect or undeliverable addresses. We only ship to the confirmed Paypal address. Please note that manufactures update their packaging from time to time and that the packaging images shown in our product may vary from what you ultimately receive however be assured you are receiving the identical contents you ordered. Return Policy You may return new, unopened items within 30 days of delivery for a refund, and a restocking fee may apply. Return shipping fees are not refundable. Message us for return instructions if you have questions. Support & Feedback We take our reputation seriously, we buy and sell online, so we understand the value of trust. If you are unsatisfied with your order, please contact us and we will work with you to resolve it to your satisfaction. Contact us via eCRATER messaging and we will respond within 1 business day. Our office hours are 8AM-4PM PST Monday-Friday. We thank you for your business!