Posted: 11/4/2013 6:44:17 PM EDT
| 5.56 Full Auto vs. M16 MPI vs. 5.56 Full Auto Premium, my question is if I should get the premium or if one of the other BCG's will do. This is just a KISS/truck gun build because I had a spare stripped lower laying around. I'm leaning toward the premium but I'd like to get some opinions. |
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I really think PSA needs to slim down their line of BCGs, so many different names and set ups, it causes so much confusion. I have the 5.56 Premium (8779) at least that's what the tube it came it says, I'm happy with it. I agree with you on that. I added all three to the comparison feature in their website, they are almost identical it would seem. The only real difference I can see is MPI. I'm hoping PSA can chime in on this one and clear it up. |
| I have a PSA premium one. Has worked well for the 350-400 rounds I've put through it. Won't cycle steel unless THOROUGHLY lubed. Replaced it with a nickel boron BCG and now steel runs fine. Deciding on whether or not to start another build or put this one in the EE. Maybe they'll have an 11.5" upper sale soon. |
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The best deal I've seen on them was a month or two ago, the Premium 5.56 BCG and a Vortex Strikefire for $200, sold the optic for $150 = $50 BCG  Quoted:
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Thank you for all of the answers, I'm keeping my eye out for a daily deal on a premium BCG! The best deal I've seen on them was a month or two ago, the Premium 5.56 BCG and a Vortex Strikefire for $200, sold the optic for $150 = $50 BCG Let's hope that comes back! I could actually use a strike fire for my range gun. |
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The difference is in the bolt material C158 vs 8620 and if its HP(T) MPI or just MPI. IMHO MPI is kind of useless if not HP tested first. If you door kicking bet the HP MPI bcg. If you train/compete/range shoot any other will do. Some very bright minds are against HPT because it WILL shorten SIGNIFICANTLY the life of the bolt. For me, MPI alone is fine, if the bolt is from a reputable manufacturer and produced to the correct specifications. |
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Some very bright minds are against HPT because it WILL shorten SIGNIFICANTLY the life of the bolt. For me, MPI alone is fine, if the bolt is from a reputable manufacturer and produced to the correct specifications. Quoted:
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The difference is in the bolt material C158 vs 8620 and if its HP(T) MPI or just MPI. IMHO MPI is kind of useless if not HP tested first. If you door kicking bet the HP MPI bcg. If you train/compete/range shoot any other will do. Some very bright minds are against HPT because it WILL shorten SIGNIFICANTLY the life of the bolt. For me, MPI alone is fine, if the bolt is from a reputable manufacturer and produced to the correct specifications. I've often debated this myself and I'm still on the fence...I'm leaning towards MPI alone. |
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It will not significantly shorten the life of the bolt. I prefer to have mine HPT and MPI, although it certainly is not necessary. HighSpeedSteel Quoted:
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Some very bright minds are against HPT because it WILL shorten SIGNIFICANTLY the life of the bolt. It will not significantly shorten the life of the bolt. I prefer to have mine HPT and MPI, although it certainly is not necessary. HighSpeedSteel Can you please back up this statement with some documentation?? Others claim a reduction of 30-50% in the lifespan after HPT. |
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Can you please back up this statement with some documentation?? Others claim a reduction of 30-50% in the lifespan after HPT. Quoted:
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Some very bright minds are against HPT because it WILL shorten SIGNIFICANTLY the life of the bolt. It will not significantly shorten the life of the bolt. I prefer to have mine HPT and MPI, although it certainly is not necessary. HighSpeedSteel Can you please back up this statement with some documentation?? Others claim a reduction of 30-50% in the lifespan after HPT. There is absolutely no way that amount of reduction is even close to true. I can tell you that Colt HP tests every single bolt in their M4 product. They are also MP inspected, but off of the top of my head, I can't remember if it is batch testing or testing every single bolt. But for our discussion it doesn't matter because Colt bolts hold together very well. They are certainly not weakened by 30%-50%. Also, the HP test is done using mil standard M197 ammo. That ammo generates a chamber pressure of 70,000 psi which is 135% the chamber pressure of M193 (52,000 psi) and 127% of M855 (55,000 psi). We are not talking about 2-3 times the pressure. That slight overpressure is not much at all give the part/gun we are talking about. You can probably get similar pressure differences out of different ammo brands, bullet weights, etc. HighSpeedSteel |