Workbook

large quantity of a previous production run selector that is slightly off dimensionally. At first glance, it may

appear that the small tab which holds the selector in place is too wide, thereby making it difficult to move.

Removing a tiny portion from the inside of this tab will work, however the problem is actually on the right

side of the selector. The portion that passes through the right side of the receiver has too short a shoulder

(dimensionally off the thickness of the pin retaining clip). This can be easily filed back. DSA fixed this

glitch about a year ago and the new selectors are a perfect drop-in fit.

Entre’prise receiver (metric). They look nice. Previous receivers were machined from billet and oversize

in the ledge over the chamber, the locking body ledge, and the receiver face/torque shoulder, and I have also

found several that had the part where the barrel threads in bored off center. Current production are cast and

then finish machined to a type I or type III configuration. While still flawed in a number of areas, they are far

superior to earlier attempts. Unlike FN-licensed or DSA receivers, they are heat treated only in the area

where the barrel screws in. A complete review with photographs is available on the ARS website under

"NOTES." After some serious conflict with an Entre'prise representative, I no longer have any confidence in

the company, or the integrity of the company's representative, and therefore I maintain serious reservations

on the company's products, despite some significant improvements.

Imbel receivers. Usually excellent, the receivers marked “Pacific Armament Company” and possibly some

others have a large gear-like logo stamped on the right side of the receiver and a deep “Fz SA 7.62mm” on

the left. I have seen some where these stamps are so deep as to cause a slight imprint inside the receiver rails,

which binds the bolt carrier. A few file strokes will eliminate this problem. Have also seen Imbels where the

relief cut for the extractor is insufficient, causing the bolt to bind when chambering a round. Can be polished

out with a tiny grinding stone, followed by a fine Cratex abrasive "bullet."

Hesse Arms receiver. Roughly cast, they are ugly with lots of pitting and porosity flaws. The etched or

cast-in markings are sloppy. Dimensionally, later production ones are not as bad as their sloppy appearance

would indicate, however after years of dealing with poor quality and shoddy workmanship from this

company, including a thousand receivers sold to Century Arms that Robert knew were shoddy ("because

Century wanted them that way"), I have decided not to work with them. I won't sink my valuable time into

something when I cannot guarantee customer satisfaction with the results.

DSA receiver (carbon steel). Slightly undersize in the undercut where the front of the dust cover goes.

Easiest fix is cutting a slight taper on the leading edge of the dust cover nose. Otherwise, a hard smack with

a mallet will force the dust cover into place. Sometimes the extractor relief cut needs enlarging (see section

on receiver prep). Otherwise an excellent receiver and the only US receiver I can recommend. Available in

Type I only, with or without the cut for the carry handle.

DSA receiver (stainless steel). I have not built enough guns on these receivers for a fair evaluation. In my

opinion, the potential increase in the corrosion resistance of stainless steel is not worth the significantly

higher price. It also limits refinishing options (no bluing or Parkerizing).

Armscorp receiver: I have only built six guns on Armscorp receivers. Three went together fine, three were

as bad as earlier Entre'prise, and in the same areas. Also, the feed ramp is only a shelf, without the semi-

circular cuts that raise the nose of the round up to the chamber, leading to the bullet impacting at the receiver

face and not chambering. Careful cutting with a fine toothed rotary tool bit can install these missing cuts.

More expensive and disappointing. I won't work on them.

DSA Free-Float Handguards. (aluminum or carbon fiber) Excellent. A somewhat tedious balancing act to

install, but they come with excellent directions. Must remove entire rear support of handguards to access the

gas tube rear support cap. If putting on an assembled gun, you must cut the existing rear handguard support.