dpete Posted March 11, 2015 Report Share Posted March 11, 2015 As I wait for Aero Precision to get stripped .308 lowers back in stock I did some fiddling with the rest of the parts I have. The barrel is on the upper, and the BCG and charging handle are in place. With the chamber empty I can push the BCG into battery with 1 finger. It pops right in. If I put a dummy round into the chamber and pushed the BCG forward. No way would it go into battery! Now these are brand new parts, NO lube has been applied yet and since I don't have the lower yet I can't use the buffer spring to slam it home. Is it normal for the extractor and its spring to be so tight that it won't allow a BCG to go into battery by pushing it? I haven't tried taking the extractor off of the bolt yet to see what that does. I thought I would ask here first and get some advice from those way more knowledgable than I am concerning a .308 AR. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted March 12, 2015 Report Share Posted March 12, 2015 Did you purchase a complete Upper with BCG ? What kind of ammo ? If your sitting at home in front of your PC ,You should be using dummy ammo for testing. There should be some pressure to seat the Bolt , have you tried pushing it in to seat ( make sure you have the charging handle installed ) & how much pressure did it take to lock & how was it to eject the chambered round ? Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted March 12, 2015 Report Share Posted March 12, 2015 The extractor isn't designed to work like that. Either use more force or strip off the extractor and try again. Quote Link to comment Share on other sites More sharing options...
Lincoln7 Posted March 12, 2015 Report Share Posted March 12, 2015 Exactly. Try again with extractor removed. You will still have to compress the ejector or remove it, too. Quote Link to comment Share on other sites More sharing options...
dpete Posted March 12, 2015 Author Report Share Posted March 12, 2015 Did you purchase a complete Upper with BCG ? What kind of ammo ? If your sitting at home in front of your PC ,You should be using dummy ammo for testing. There should be some pressure to seat the Bolt , have you tried pushing it in to seat ( make sure you have the charging handle installed ) & how much pressure did it take to lock & how was it to eject the chambered round ? 1. Yes 2. Nothing but a dummy round so far. 3. I am using a dummy round. 4. There is a ton of pressure, so much so that I haven't been able to get the dummy round to chamber at all so no ejection yet, and the charging handle is installed. Quote Link to comment Share on other sites More sharing options...
dpete Posted March 12, 2015 Author Report Share Posted March 12, 2015 The extractor isn't designed to work like that. Either use more force or strip off the extractor and try again. Stripping off the extractor was the route I was thinking about. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 12, 2015 Report Share Posted March 12, 2015 You're trying to overcome the force of the extractor spring, and make the extractor snap in over the bottom of the round. You're trying to overcome the force of the ejector spring, and compress the ejector with your finger. Gonna be pretty hard to do... Nothing odd happening there, move along folks, move along now... Quote Link to comment Share on other sites More sharing options...
Toolndie7 Posted March 12, 2015 Report Share Posted March 12, 2015 You should strip that bolt and check your head space anyway. Even if it head spaces on the tight side the upper may loosen up as everything seats in. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted March 12, 2015 Report Share Posted March 12, 2015 1. Yes 2. Nothing but a dummy round so far. 3. I am using a dummy round. 4. There is a ton of pressure, so much so that I haven't been able to get the dummy round to chamber at all so no ejection yet, and the charging handle is installed. I would check to make sure the Dummy round is of the correct caliber & not damaged in some way .You make it sound as if you would need a press to seat/chamber the round . You should have no problem over coming the slight pressure the Extractor & Ejector exert. You should be able to force it into battery with the palm of your hand . How much pressure does everyone think the Buffer Spring exerts to chamber a round . Its not much , it also has to strip a fresh cartridge from the magazine , which slows the force of the spring down, before the spring pressure chambers the cartridge . I just chambered a hand loaded dummy round into two of my 308AR's by pushing the BCG , with the palm of my hand The Upper shot gun'ed from the lower & ejected with out a problem. You have something not right , be it the dummy round or there is something about the head space of that Upper or your ton of pressure is just something your not used to . DO NOT force the dummy round if it is taking a metric ton of pressure & not chambering , its your decision & experience if you think its too much , take it to some one to have them check it out . Be careful & let us know what you come up with & photo's always are welcome <thumbsup> Quote Link to comment Share on other sites More sharing options...
dpete Posted March 12, 2015 Author Report Share Posted March 12, 2015 I would check to make sure the Dummy round is of the correct caliber & not damaged in some way .You make it sound as if you would need a press to seat/chamber the round . You should have no problem over coming the slight pressure the Extractor & Ejector exert. You should be able to force it into battery with the palm of your hand . How much pressure does everyone think the Buffer Spring exerts to chamber a round . Its not much , it also has to strip a fresh cartridge from the magazine , which slows the force of the spring down, before the spring pressure chambers the cartridge . I just chambered a hand loaded dummy round into two of my 308AR's by pushing the BCG , with the palm of my hand The Upper shot gun'ed from the lower & ejected with out a problem. You have something not right , be it the dummy round or there is something about the head space of that Upper or your ton of pressure is just something your not used to . DO NOT force the dummy round if it is taking a metric ton of pressure & not chambering , its your decision & experience if you think its too much , take it to some one to have them check it out . Be careful & let us know what you come up with & photo's always are welcome <thumbsup> The dummy round is a hornady match 308 that I pulled, dumped the powder, deprimed and reseated to 2.700 I also tried a pulled, unfired Remington 308 case without a bullet. The only attempts to get it into battery have been pushing on the BCG with the base of my hand. The ton of pressure I spoke of is more than I can exert without causing pain. I'm not going to go bashing the BCG on to a block of wood or something like that to try to get it into battery just for the sake of doing it. The main reason I asked is my other 300 Blackout and 556 ARs push into battery with a bullet loaded with finger pressure but they also have 100s of rounds through them already. The anticipation and this waiting for the lower to arrive is getting me antsy to get this 308 done and I'm probably over thinking things. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 14, 2015 Report Share Posted March 14, 2015 How much pressure does everyone think the Buffer Spring exerts to chamber a round . Its not much , it also has to strip a fresh cartridge from the magazine , which slows the force of the spring down, before the spring pressure chambers the cartridge ALOT!!! SS, lock your bolt to the rear, stick your finger in the ejection port, and hit the bolt release... Tell me that's not ALOT of pressure!!! <lmao> ***NOTE - I will want pics of the fingernail in 2 weeks, then 6 weeks... <laughs> Quote Link to comment Share on other sites More sharing options...
survivalshop Posted March 15, 2015 Report Share Posted March 15, 2015 (edited) ALOT!!! SS, lock your bolt to the rear, stick your finger in the ejection port, and hit the bolt release... Tell me that's not ALOT of pressure!!! <lmao> ***NOTE - I will want pics of the fingernail in 2 weeks, then 6 weeks... <laughs> You can be assured its not a TON of pressure <laughs>. Still shouldn't need a lot of hand pressure to seat it , I would like to see if the chamber head spaces correctly . I just got over my MAC 10 Pinch & not all that willing to stick my finger any where it doesn't belong , even by accident ! I will not participate in your Smashed finger nail Fetish ! <lmao> Edited March 15, 2015 by survivalshop Quote Link to comment Share on other sites More sharing options...
blue109 Posted March 15, 2015 Report Share Posted March 15, 2015 tom...your black-nail fetish is slightly disturbing... Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 15, 2015 Report Share Posted March 15, 2015 Damn, I've smashed so damn many fingers so far in life. I can tell right away whether that nail is a goner, or if it'll make it. <lmao> Quote Link to comment Share on other sites More sharing options...
dpete Posted March 15, 2015 Author Report Share Posted March 15, 2015 UPDATE!! I removed the extractor (had a devil of a time pushing it in enough to release the spring pressure on the pin) and found 2 o-rings around the spring. I put the BCG back into the upper and it quite easily slide into battery. Not as easily as my 5.56 and 300 Blackouts but easy enough to do it with one finger. I had the same devil of a time getting the extractor pin back in but all is back where it belongs now. What is the best way to remove the ejector retainer pin to prevent the plunger from flying off to who knows where when the pin comes free? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 15, 2015 Report Share Posted March 15, 2015 Have you even shot this thing yet? Quote Link to comment Share on other sites More sharing options...
dpete Posted March 15, 2015 Author Report Share Posted March 15, 2015 I'm waiting for the lower and gas block to arrive from Aero. They were supposed to be back in stock last week. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted March 15, 2015 Report Share Posted March 15, 2015 UPDATE!! I removed the extractor (had a devil of a time pushing it in enough to release the spring pressure on the pin) and found 2 o-rings around the spring. I put the BCG back into the upper and it quite easily slide into battery. Not as easily as my 5.56 and 300 Blackouts but easy enough to do it with one finger. I had the same devil of a time getting the extractor pin back in but all is back where it belongs now. What is the best way to remove the ejector retainer pin to prevent the plunger from flying off to who knows where when the pin comes free? Two o-rings around the spring ? I would think one would be sufficient with the spring . I have a tool to remove the Ejector , but its not needed , but makes it so easy, I wouldn't do one with out it now. May just fall out , but don't bet on it . Put a box or something in front of the Bolt face ,that will stop it , the Pin Punch should stop the ejector from flying out , just put your finger in front of the Ejector , then remove the Punch. Putting it back in is the challenge , that pin slot in the Ejector has to be lined up to drive the pin back in. You can get it set up with another Pin or punch , to help reinstall the pin . Waiting for the lower to test & fire the complete rifle may help , but you can oil the Ejector & work it with a Pin Punch & the Ejector may loosen up a bit . I disassemble , clean & inspect ,every Bolt before installing . Quote Link to comment Share on other sites More sharing options...
dpete Posted March 15, 2015 Author Report Share Posted March 15, 2015 I thought 2 o-rings was excessive too. Right now all I can do with it is things like this, and plot and plan. Quote Link to comment Share on other sites More sharing options...
dpete Posted March 19, 2015 Author Report Share Posted March 19, 2015 You can be assured its not a TON of pressure <laughs>. Still shouldn't need a lot of hand pressure to seat it , I would like to see if the chamber head spaces correctly . I just got over my MAC 10 Pinch & not all that willing to stick my finger any where it doesn't belong , even by accident ! I will not participate in your Smashed finger nail Fetish ! <lmao> I just got back from the local gunsmith and the headspace is perfect. He said its rare to see a bolt/chamber combination this well matched. Now I've got the peace of mind to continue the build and not have to worry about a headspace issue. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted March 19, 2015 Report Share Posted March 19, 2015 Well if it Head Spaced OK , it must have not took that much pressure to lock the Bolt into Battery . <dontknow> I would look at your Dummy test rounds . Quote Link to comment Share on other sites More sharing options...
dpete Posted March 20, 2015 Author Report Share Posted March 20, 2015 She's done! See post #8 in this thread. Quote Link to comment Share on other sites More sharing options...
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