![]() |
| | #26 (permalink) | |
| Corporal Join Date: Jan 2010 Location: Johnson City
Posts: 151
|
Thanks for gathering that info av8r, I appreciate it. I also appreciate that info on lead time you got from m1s, after calling them. That in itself will probably cause me to look elsewhere. If I end up taking a few more weeks, or a month to decide what to pick up, I'd be looking at it showing up around the beginning of June. After reading through some of the links last night, I'm not planning on picking up a full kit from anyone. Most of the complaints about them were that the uppers were nice, but the remaining pieces were cheap. So I'm back to piecing together everything for the lower, and just picking up a complete upper. Of course I will probably change my mind again, and just build an upper too ![]() Quote:
FrankRochestr, thanks for the info. I understand what you mentioned throughout you posts. I build rockrawlers/racers and understand the whole quality/price comparison. I also understand that I could keep saying it's only another $100, 6-7 more times and end up with a $1300 upper (My wife has heard that argument many times with my buggy ), or that just because it's new doesn't make it bad. I will look into those other mfg's you mentioned, if the price difference is really that marginal.
| |
| | |
| | #28 (permalink) | |
| Captain Join Date: Nov 2008 Location: Rochester
Posts: 537
| Quote:
| |
| | |
| | #29 (permalink) |
| Corporal Join Date: Jan 2010 Location: Johnson City
Posts: 151
| So when you're comparing these to, what you consider, lesser quality; what components make these better? Or is it just the whole package? Say I were to piece together an upper instead of buying complete, is it the barrel that seperates these makes from the others? Or is it a combination of barrel/upper reciever/bolt assem?
|
| | |
| | #30 (permalink) | |
| Captain Join Date: Nov 2008 Location: Rochester
Posts: 537
| Quote:
Ok.. with regards to quality differences. It really is the sum of all its parts. When talking about mil-specs. The military / Colt/ FN has gone through extensive testing to see what materials and processes are the best for that particular parts purpose. For instance, a Mil-spec bolt is required to be made from a type of Carpenter(?) steel alloy. It is then shot peened to help reduce metal fatigue. Then it is proof fired and then magnetic particle tested for any microscopic cracks or flaws. When you buy a Mil-spec bolt, that means this process has been done to every bolt. Many lower tier manufacturers only batch test them. With the M4 gas system, the operating pressures are like 3x higher compared to the M16's 20" barrel and longer gas system. This puts alot of stress on the bolt. Wouldn't you want to know that the bolt you put in has been fully inspected? As far as barrels... if it is made to mil-spec's you know you are getting a very controlled, consistent steel. The proper 5.56 NATO chamber is another very important thing. Lots of places claim to chamber for 5.56 but in reality, it isn't NATO spec. .223 remington and 5.56 x 45 are not interchangeable. You can fire .223 in a 5.56 chamber but not the other way around. There are other reasons besides the chambering difference that you shouldn't do this. 5.56 x 45 is higher pressure, most lower tier manufacturers cut thier gas port oversize so their rifle will function with the lower powered .223 rounds. So when you run 5.56mm in it, the increased pressure pounds on your reciever because its working harder. They also use the lighter weight AR-15 bolt carrier and CAR buffer which can make the problem worse. A M16 bolt carrier made to the proper specs should be used along with the proper weight buffer(CAR buffers are too light). This gives the system the proper weight(inertia) to maintain the proper cycling rate. A properly staked gas key is vital as well. If it isn't, the gas key screws can vibrate loose under heavy usage and cause a poor gas seal. Then your rifle will start short stroking because its not getting the proper gas pressure. This could be your death in a life threatening situation. Anyways, gotta get back to work. Let me know if you have any other questions.. | |
| | |
![]() |
| Bookmarks |
| Tags |
| complete, kits, uppers |
| Thread Tools | |
| Display Modes | |
| |
Similar Threads | ||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Xd trigger kits | pistolaccents.com | Pistol Accents | 3 | 06-08-2010 02:42 PM |
| XD / XDM Trigger Kits on Sale | pistolaccents.com | Pistol Accents | 0 | 01-24-2010 10:01 PM |
| Ghost Glock Trigger Kits | pistolaccents.com | Pistol Accents | 0 | 11-03-2009 09:30 PM |
| Bravo Company M4 16" complete uppers in stock | darkvibe | General Firearms | 19 | 08-08-2009 05:15 PM |
| M4 uppers in stock at PKFirearms | darkvibe | General Firearms | 3 | 06-13-2009 11:49 PM |