![tune1911.jpg](/media/zkln2qyb/tune1911.jpg?anchor=center&mode=crop&width=987&height=551&rnd=132616822629070000&quality=60)
Gallery
![Gap](/media/tsfgbntb/2027bbl-gap.jpg)
Gap
There should be a gap of about 0.030 inches between the bottom edge of the barrel throat and the top of the feed ramp in the frame.
![Throat the Barrel](/media/e1keexxf/2027bbl-throating.jpg)
Throat the Barrel
A Dremel tool can be used to carefully throat an M1911 barrel.
![Polishing the Feed Ramp](/media/keplbmh1/2027ramp-polish.jpg)
Polishing the Feed Ramp
Polishing the frame feed ramp is often best accomplished simply with 600-grit or finer sandpaper wrapped around a wooden dowel.
![Ejection Reliability](/media/uwil51wx/2027ports2.jpg)
Ejection Reliability
Ejection reliability of a gun with the high G.I. ejection port is enhanced by lowering the port and flaring it at the rear.
![Feed Ramps](/media/z3niieps/2027feed-ramps.jpg)
Feed Ramps
Frames for different calibers have different feed ramps. Shown here are frames for the .45 ACP and 9 mm Luger.
![Guide Rods](/media/fznbfmtd/2027guiderods2.jpg)
Guide Rods
Guide rod heads, particularly of aftermarket, full-length guide rods, may contact the lower barrel lugs and should be relieved for clearance.
![Proper Barrel throat](/media/xvujek0d/2027bblthroats2.jpg)
Proper Barrel throat
A properly throated M1911 barrel is shown next to an original G.I. barrel with its minimal throat.
![Beveling the Port](/media/fgyfo5t0/2027ejecport-clear.jpg)
Beveling the Port
In addition to fluting the rear of the ejection port, a gunsmith will also clear or bevel the inside edge of the port to enhance ejection reliability.
![Extractor](/media/1txiqgxj/2027extractor.jpg)
Extractor
Beveling and flaring the extractor claw helps the case rim slide under the claw.
![Slide Stop](/media/rvbngsli/2027slidestop-detent.jpg)
Slide Stop
A shallow detent or dimple in the slide stop face can prevent the slide stop from inadvertently rising and causing the slide to lock back prematurely.