{"product_id":"mec-330-primer-seating-spring-for-600-jr-mark-5-sizemaster-steelmaster","title":"MEC 330 Primer Seating Spring for 600 Jr \/ Mark 5 \/ Sizemaster \/ Steelmaster","description":"\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eThe \u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eMEC #330 Primer Seating Spring\u003c\/span\u003e\u003c\/strong\u003e is a genuine factory replacement spring used in the primer seating assembly on \u003cstrong\u003eMEC single-stage shotshell reloading presses\u003c\/strong\u003e. This small but critical coil spring provides the tension that drives the primer cup forward to seat primers uniformly into fresh shells, and it is one of the most commonly replaced wear items on a workhorse MEC press.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eMEC part \u003cstrong\u003e#330\u003c\/strong\u003e is built to fit the primer seat assembly on a wide range of MEC single-stage reloaders, including the \u003cstrong\u003e600 Jr.\u003c\/strong\u003e (both Pre-1982 and 1982-1985 production), the \u003cstrong\u003eMark 5\u003c\/strong\u003e, \u003cstrong\u003eSizemaster\u003c\/strong\u003e, \u003cstrong\u003eSteelmaster\u003c\/strong\u003e, and the \u003cstrong\u003e700 Versamec\u003c\/strong\u003e (Pre-1982 and 1982-1985). It works together with MEC primer cup \u003cstrong\u003e#326\u003c\/strong\u003e and primer seating pad \u003cstrong\u003e#331\u003c\/strong\u003e to make up the complete primer seat assembly for these presses.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003eIf your finished shells are showing inconsistent primer seating depth, primer push-backs, or your primer cup is not returning crisply between cycles, the seating spring is the usual culprit. Swapping in a fresh MEC #330 spring is a quick, inexpensive fix that restores positive primer seating on your existing press without replacing the whole machine.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan style=\"font-size: 14pt;\"\u003e\u003cstrong\u003eMade in the USA\u003c\/strong\u003e by MEC, this is an OEM replacement part sold individually as a single spring.\u003c\/span\u003e\u003c\/p\u003e","brand":"MEC","offers":[{"title":"Default Title","offer_id":55372582256962,"sku":"330","price":2.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/7921\/5682\/files\/hires_a27e4ade-5ea6-4a98-8b56-ccc4be6056f4.png?v=1785230455","url":"https:\/\/centerfiresystems.com\/products\/mec-330-primer-seating-spring-for-600-jr-mark-5-sizemaster-steelmaster","provider":"Centerfire Systems","version":"1.0","type":"link"}