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Posted: 1/14/2012 8:03:33 PM EDT
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No expert here by any stretch of the imagination as I have only built 1 lower and thats it.
But I performed a function test of the FCG on mine and all is well. My cousin is building a .300blk and bought a Spikes lower and DPMS lower parts kit. He put it together and brought it over for "show and tell" 
He was showing it and pulled the trigger a couple times...........(but not letting it slam the lower or bolt catch) I told him to pull the trigger and HOLD it back, I cocked the hammer and guess what?....... Yea it didn't catch and hold. After about 5 times of cocking it and him not releasing the initial hold back on the trigger, I said .... WTF did you buy a full auto ........... He did not install the disconnecter spring...... So with my limited knowledge , would this cause a FA to occur? As long as he held the triggrer , the hammer appeared that it would fall every time the BCG cycled. I asked if he had any left over springs and he said he would look in the bag. |
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I doubt it (the hammer) would have the power (momentum striking the firing pin) to ignite the primer on every shot. It would just ride the carrier forward requiring you to manually cycle the action. (to recock the hammer)
ETA: in parentheses (sp?) Posted Via AR15.Com Mobile |
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Quoted:
it could cause a slam fire. this is when the hammer follows the bolt carrier and strikes the firing pin. this could happen before the bolt is closed and someone could get hurt. Correct me if I'm wrong, but if the bolt is OOB it will still be forward so the firing pin can't connect with the primer right? |
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Quoted:
Quoted:
it could cause a slam fire. this is when the hammer follows the bolt carrier and strikes the firing pin. this could happen before the bolt is closed and someone could get hurt. Correct me if I'm wrong, but if the bolt is OOB it will still be forward so the firing pin can't connect with the primer right? The bolt carrier remains a short distance back until the bolt rotates closed, and the firing pin can't contact the primer until then. However, the momentum of the free floating firing pin already is enough to put a small dent on the primer, and the extra pressure that the hammer applies can make the difference between going boom or going click. A gun that fires more than one shot for each trigger pull is considered a "machine gun." A gun that can only fire once every other cycle is a "P-O-S." |
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NO... leaving out the disconnector spring will not make an AR15 a full auto... you need to put that spring in there see if there is anything else going on with the disconnector... if you dont have it in the bag find a make shift spring from a click pen... you know a writing pen that you have to click the top or a button to get the ink stick to come out... open that fucker up and steel the little spring inside and cut down to size and use it as a disconnector spring until you order another spring for the vendor you bought the LPK from...
i take it that you and you cousin have not shot the AR in question...??? if you had you will notice that more than likely you will have a single fire weapon... meaning one shot then click no shot and then a pull of the charging handle with finger off the trigger to be able to shoot another round off.. but loosing the other round that is chambered... this is no good...!!! you need that spring in there for it to work properly... put it in there and have a nice day 
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