Posted: 2/8/2009 12:00:22 PM EDT
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For information purposes only, do so at your own risk, etc.
Factory Beretta Parts Wolff Parts FYI The mainspring isn't merely "there", but works (however slight) for lockup, dwell time, and recoil. The recoil spring plays a very important role in lockup. An AR-15 extractor spring will fit perfectly in place of the Beretta extractor spring. Standard Spring # for Beretta M9/92FS Recoil spring - 13 # Mainspring - 20 # Mainspring D - 18 # Stock Mainspring Trigger Pull Single Action - Maximum 6.3 # to a Minimum 3.9 # with Average 5.2 # Double Action - Maximum 16.2 # to a Minimum 11.8 # with Average 14.4 # Measured on 28 sample guns at the center of the trigger. Mainspring D Generally see a decreased trigger pull for Double Action of 2 - 2.5 # and Single Action 1 - 1.5 # 2:1 Rule To keep wear to minimum, keep a 2:1 ratio (Mainspring:Recoil). The recoil and mainspring work in conjunction. Decreasing the # for the mainspring can increase light primer strikes. Increasing the # for the mainspring can see slightly more wear to the hammer and slide. Decreasing the recoil spring # can see slightly more frame wear. Increasing the # for the recoil spring can see slightly more muzzle flip. The safe limit for the mainspring is a 4 # decrease/increase for the mainspring. It is safe to drop 2 # without an increase # for the recoils spring (changing the stock mainspring for a mainspring D spec). Still preferable in this case is an increase of the recoil spring to 14 #. Past that the lower safe limit is 16 # mainspring(usually called a Competion or Comp spring) and should have an increase to the recoil spring to 14-15 #. The safe limit for the recoil spring is 2 # decrease/increase for recoil spring. Unlike the mainspring, any decrease in # to the recoil spring should see an increase of 2 # to the mainspring. Generally a decrease of # for the recoil spring should be discouraged as increased wear, reduced consistent lockup, and decreased dwell time are exacerbated. Wolff Trigger Return Spring A good upgrade/replacement for the factory trigger return spring for those with METAL triggers. Generally the standard unit is desired as the reduced/extra power units are negligible for trigger pull # and trigger reset. Do NOT Do NOT put a 1911 mainspring in your Beretta. The curve for poundage is different between the two. The Beretta has a higher # curve at the beginning of its compression than the 1911's. You WILL see increased wear over the life of the pistol, particularly at the front of the rear slide rails. Do NOT modify springs, most notably the mainspring. Cutting springs introduces a new # curve; the # of the mainspring and recoil spring are such to have proper cycling of the slide and contact of parts (slide contact with the hammer at different points of the cycle for example) during this cycle. Cutting/modifying springs can introduce wear that isn't noticeable for thousands of rounds that can be detrimental to reliability and accuracy. |
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Quoted:
Do NOT put a 1911 mainspring in your Beretta. The curve for poundage is different between the two. The Beretta has a higher # curve at the beginning of its compression than the 1911's. You WILL see increased wear over the life of the pistol, particularly at the front of the rear slide rails. Do NOT modify springs, most notably the mainspring. Cutting springs introduces a new # curve; the # of the mainspring and recoil spring are such to have proper cycling of the slide and contact of parts (slide contact with the hammer at different points of the cycle for example) during this cycle. Cutting/modifying springs can introduce wear that isn't noticeable for thousands of rounds that can be detrimental to reliability and accuracy. +1 I've been catching hell from several people whom push this 1911 mainspring in a 92FS nonsense. Personally, I've never been able to understand this compulsion of swapping one model's parts into another model............ 
Glad to see I'm not the only one whom thinks this way! 
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