ar15: 9mm bolt ramping?

[koxx.dta]

after much research i am trying to find out what type of bcg i need to complete my 9mm ar15. i have spike's lpk with the rounded trigger and need help on what bcg to use and if i need to ramp it or not...any help is greatly appreciated, google has been used but found many conflicting answers.i trust calgunners more anyway haha

planning on going with this

[emy]

your gtg on that , If you change back and fort between 9 and 223 get the ramp bolt so you don"t have to change the hammer

[CHS]

after much research i am trying to find out what type of bcg i need to complete my 9mm ar15. i have spike's lpk with the rounded trigger and need help on what bcg to use and if i need to ramp it or not...any help is greatly appreciated, google has been used but found many conflicting answers.i trust calgunners more anyway haha

planning on going with this

What kind of 9mm upper are you using? Colt style, or Olympic style?

If Colt style, then you can get Ramped bolts from CMMG or Spikes. You can also get standard bolts from RRA and have them ramped.

[koxx.dta]

colt style

thanks for the help

what is it about the spikes hammer that makes it (Works with ALL calibers). i know the hammer is rounded what difference does this make

[CHS]

what is it about the spikes hammer that makes it (Works with ALL calibers). i know the hammer is rounded what difference does this make

The Spikes hammer isn't special. It's just rounded on its face like a proper M16 hammer, as opposed to the notched faces of Colt/Bushmaster hammers from the anti-lawsuit days:


These hammers WILL work with a non-ramped 9mm bolt, but I don't recommend it. Either get the proper 9mm hammer from Colt or RRA, or get your bolt ramped if you're going to use the standard hammer.

The problem with the standard hammer is the bolt hits it at a fulcrum point way below where a normal hammer is hit which puts rearward forces on the hammer pin and can egg out the hammer pin hole. The 9mm hammer is designed with a special notch that catches the bolt and minimizes these forces. When using a ramped bolt, the bolt hits the hammer at a higher fulcrum point which helps the hammer pivot out of the way, which doesn't put stress on the hammer pin hole.

In this order, is what I would recommend:
1.) Ideal situation is rounded hammer with ramped bolt.
2.) Second best would be 9mm hammer with non-ramped bolt.
3.) Third option would be rounded hammer with non-ramped bolt.

For options 2 and 3 I highly recommend the KNS anti-rotate/anti-walk pins because even with the dedicated 9mm hammer you still get unwanted forces on the hammer pin hole which can lead to premature wear. With option 1 it's not an issue.