This spring only fits RIA 3.10 pistols that are GEN2.
Gen2 pistols are serialized anything RIA2259511 and BELOW.
1911 - 3.10 - Reverse Recoil Spring Plug (Gen2 3.10)
**Proper gunsmith fitting required for accurate fit & safe function.
PLEASE NOTE: If you purchase this item by mistake and would like to return it, we will accept your request. However, we reserve the right to charge you a 10% restocking fee if the item is damaged, scratched, or altered from its original state. You will also have to pay to ship back to us. Thank you.