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Posted: 3/25/2003 8:01:12 PM EDT
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Take it easy on me man. Why is it ill-advised to switch bolts between uppers (rifles)??? How tough is it to switch my front pin to the push-pin option? Any special parts or tools required? Does the 7.62x39 require a special mag? I know the upper changes, but are the mags unique or can the standard 5.56 hold/feed the rounds. Does the Bushmaster Snap-On Forearm Mount stay secured on the forearm? I only want to mount a Surefire right now, and don't have the $$ (actually I just don't want to spend it just yet...) for a Knight's. Just want something that will hold a light and mounting bracket. Thanks for the help guys. This is a helpful lot that hangs here. Mike |
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Mguy, In order: Switching Bolts: Some say switching used bolts between used uppers is bad due to the various wear patterns and headspace issues that may either directly result or develop over time. This is assuming you have a reason other than direct and permanent replacement to change bolts. That said, I've heard cases where recruits routinely dumped every bolt carrier assembly into a cleaning vat and as long as your M16 had one at the end of the day, the DI was happy. So with this question, you'll hear both the "parade of horribles" as well as the "I shoot one bolt in 53 different uppers" replies. Odd thing is, both are right. Heavy shooting using mismatched or often switched bolt-barrel extension combinations will give odd wear patterns, over time, but assuming there are no initial headspace issues, a few rounds trough a different barrel using a borrowed bolt/carrier assembly is no big deal. Simply check the headspace-- a No-Go guage is about $15. Front push pin: The Colt screw type just screws out; the real push pin type comes out by using a pick, probe or fine nail to depress the detent in the pin slot enough to remove the pin. Do this by turning the pin still in the right side hole. This frees the pin but controls the detent and spring. Drop the probe and control the release of the detent and spring as you remove the pin from the lower receiver. Some use a paper bag over the whole thing at this stage. You don't really need the tool for [re]installing the pin, just use the old pin in from the left side (don't let the detent enter the grove though) and cover the detent once it is depressed by a thin screwdriver blade. Slide the new pin in from the right and displace the pin in from the left. Turn the new pin until the detent enters the channel and you're done. Use care depressing the detent and don't let the left pin move until the right (new) pin dispaces it-- many detents and springs are lost this way. 7.62: It does require special mags. Cheaper Than Dirt, among others has them... cheaper than um dirt. Snap-on mount: I have no idea, no experience with it. |
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Quoted: Why is it ill-advised to switch bolts between uppers (rifles)??? Because you can change the headspace (that can be a very bad thing - if swaping bolts always test with a Field Gage). Also, it causes extra wear on the bolt's lugs (as the bolt wears to fit the locking logs on the other barrel). How tough is it to switch my front pin to the push-pin option? Any special parts or tools required? Ahh you got a Colt? This depends on the version you have it ranges from easy to PITA. Consult a Colt expert. Does the 7.62x39 require a special mag? If you want to put more than 7 rounds in a magazine & have it function it does. USGI 20's & 30's can hold/feed up to 7 rounds - anymore and you'll have feed & jamming issues. Best idea is to buy 7.62x39 AR magazines Does the Bushmaster Snap-On Forearm Mount stay secured on the forearm? Don't know haven't tried it. I only want to mount a Surefire right now, and don't have the $$ (actually I just don't want to spend it just yet...) Well then you can buy the GG&G rail (about $35) that fits on the bottom of the handguards and use a 1" scope ring - or you can try one of these inexpensive Do it Yourself projects: I used this one for a couple of years before getting my Fobus lower handguard: [url]http://groups.msn.com/TheMarylandAR15ShootersSite/makeaflashlightmount.msnw[/url] [url]http://groups.msn.com/TheMarylandAR15ShootersSite/frontsitelightmount.msnw[/url] |
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